Ubuntu is a Linux distribution with an emphasis on ease of use and installation. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.

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Discrepancy between Ubuntu 16.10 System Monitor % CPU and ps pcpu, % CPU utilization with respect to the individual Firefox browser process

What is the reason for the following discrepancy between Ubuntu Linux 16.10 System Monitor % CPU utilization and ps pcpu, % CPU utilization with respect to the individual Firefox browser process? For ...
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0answers
38 views

How do we programatically tell if our bash script was succesful in starting or stopping mono-service -l:${LOCK_FILE} ./${PROGRAM_NAME}.exe?

I am running Ubuntu Linux 16.10 on an Ubuntu ThinkStation desktop. I used a bash script just now to restart and stop mono-service on our second Ubuntu Linux 16.04 desktop computer in the following ...
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2answers
48 views

IP tables for home use

I've been trying to set up rules for a desktop I have in my home network and even though at first this configuration worked, I changed something somewhere and now it won't pass any kind of connection. ...
3
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1answer
48 views

Unable to change username (“user <olduser> is currently used by process <number>”)

I already read this, but it hasn't helped. Not having logged in to the 'olduser', I type sudo usermod -l 'newuser' 'olduser' and it yields the error message from the title of my question. What can I ...
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0answers
97 views

Ubuntu 16.04 with read-only filesystem and writable layer

(This is a cross post from askubuntu, as I think here are more people to know how to get this working) I want to set up Ubuntu 16.04 like a live CD. This worked great in Ubuntu 12.04 but with 16.04 ...
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1answer
38 views

Updating drivers in Windows 10/Ubuntu 14.04 dualboot

I have just recently installed Ubuntu onto my Win10 Laptop on a HP Probook 4530S. Both seem to be working fine with GRUB as the bootloader. I was trying to install an upgrade to the Intel Chipset on ...
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42 views

After Ubuntu update from 15 to 16.04, error in keyboard-configuration package

So I just started the automatic upgrade of my Ubuntu distribution this morning, from 15.xx to the new 16.04, everything went smoothly except for an error I got at the end: something prevented the full ...
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2answers
72 views

No space left on device- on Amazon EC2 instance Ubuntu

I just expanded my storage space on Amazon EC2, after I ran out of volume. However, even after doing so, I receive an error message as follows: ubuntu@ip-172-31-30-27:~/walt/bin$ LC_ALL=C sort -k 1,...
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1answer
83 views

How to regain access to the lost user , linux3 , of two side by side Ubuntu 16.04 instances?

Three days ago, I tried installing the second of two Ubuntu Linux 16.04 versions side by side on the same Lenovo Thinkstation desktop using the procedure described in this URL, http://askubuntu.com/...
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1answer
136 views

Dell and L/Ubuntu16.04 drops wifi connection on all devices [closed]

I installed Lubuntu 16.04 and Ubuntu 16.04 on my Dell Inspiron 7720 (Edimax router) and smth strange happens. At first the connection is established and google can be loaded. When trying to update ...
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1answer
272 views

Cannot run 32-bit executable on 64-bit system with multi-arch support [closed]

I compiled a 32-bit executable for a Linux machine. It runs on most Linux distros without trouble. However, on Ubuntu 16.04 LTS, I get the No such file or directory error when trying to execute it. ...
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2answers
43 views

Is the difference between mono-runtime and mono-complete related to whether MySQL inserts successfully take place on Ubuntu 16.04?

What is the difference between 1. sudo apt-get install mono-runtime and 2. sudo apt-get purge --remove mono-complete followed by sudo apt-get install mono-complete on an Ubuntu linux 16.04 instance? ...
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0answers
62 views

Where are the definitions for the prototype declarations in <bsd/stdlib.h>?

I have a C program on Ubuntu 16.04, in which I would like to use arc4random_uniform. typedef unsigned char u_char; #include <bsd/stdlib.h> int main () { return (int) arc4random_uniform(100); } ...
3
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2answers
497 views

Starting VirtualBox kernel modules …failed

I'm trying to install Virtualbox on my desktop: Processor: AMD FX(tm)-8350 Eight-Core Processor × 8 OS type: 64bit Ubuntu 16.04 Here's a snapshot of my bash history: 35 sudo dpkg -i /home/andy/...
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1answer
87 views

`isolcpus` kernel parameter has no effect on Ubuntu 16.04 desktop

I added the following line to /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1,3" then ran sudo grub-update (and rebooted) but according to top processes are still being ...
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0answers
27 views

Change Postfix email recipient on Ubuntu 15.10

I installed Postfix on my Ubuntu machine and i'm using Gmail's SMTP to actually deliver the emails using this tutorial. This is the email headers: Reporting-MTA: dns; crmpicco-desktop X-Postfix-...
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1answer
63 views

What are all the Mono dependencies required to run all types of C# Windows Forms applications?

What are the other Mono dependencies besides mono-runtime and libmono-system-windows-forms4.0-cil required to run C# Windows Forms applications on Ubuntu Linux 16.04? Does the answer to our question ...
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0answers
67 views

No perf (linux-tools) for kernel 4.5.2

When I first installed 16.04 LTS, at kernel 4.4.0, I had a decent battery life of about 3 hours average, but I upgraded to 4.5.2 to solve the suspend problem and some other issues, and now it's less ...
2
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2answers
62 views

When opening a terminal does not require a login?

Speaking about Linux and in particular Ubuntu (from 14.04) systems: Case 1 - As pointed out in this answer, processes that allocate a pseudo-terminal don't need to make a login: for example, cups. ...
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0answers
34 views

Vsftpd server will not create ftp user directory

When I try to login to my ftp server I get 500 OOPS: cannot change directory:/mnt/users/alex When I try to do the same thing with sftp I get packet_write_wait: Connection to 10.0.0.8 port ...
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0answers
29 views

Reclaiming disk space in Ubuntu

In VMWare the hard disks took 13.6 GB, But with df, only 5.8 GB is occupied I don't quite get it. This Virtual Machine has no snapshots, and I already clicked on refresh button in VMWare Fusion ...
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0answers
35 views

Nemo file manager - change focus from the sidebar to the main view (automatically)

I find it hard to change the focus (either by keyboard, or automatically) from the sidebar to the contents view in Nemo 2.8.7 on Ubuntu 16.04. Nautilus does not have this problem. I want to be able ...
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0answers
86 views

wifi driver fails to load firmware on kernel 4.6.0-rc2

Distro - Ubuntu-14.04. For development purposes I built and installed 4.6.0-rc2 kernel. All works well except wifi: % dmesg ... [ 9.092503] Intel(R) Wireless WiFi driver for Linux [ 9.092506] ...
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40 views

wakeonlan: cannot wake up ubuntu server 16.04

I can wake up ubuntu server 16.04 from my iphone using WOL. I tried to do the same thing from mac osx yosemite. couldn't get it work. first I installed wakeonlan. "brew install wakeonlan" then I ran ...
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2answers
419 views

ubuntu server 16.04: cannot get supervisor to start automatically

I installed supervisor on ubuntu server 16.04. $ sudo apt-get install supervisor $ sudo update-rc.d supervisor defaults After rebooting, supervisor didn't get started automatically. Checked the ...
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0answers
50 views

Can't purge old kernels (dependency problems), but /boot is out of space

I'm running Ubuntu 14.04.4 LTS, and I'm trying to install a new package using apt-get. Unfortunately, whenever I try I get messages like: The following packages have unmet dependencies: linux-image-...
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1answer
55 views

Subsequent calls to wpa_supplicant fail - can't connect to wifi

I have an ubuntu 15.10 server which utilizes wpa_supplicant to connect to wireless network profiles created with wpa_passphrase. On a fresh reboot, the first time I call sudo wpa_supplicant -B -i ...
5
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2answers
298 views

How to Install R's devtools and digitize?

I need devtools because I need the function install_github to install the non-CRAN package digitize here. I installed R by sudo apt-get install r-cran-robustbase I did not install R's packages ...
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0answers
34 views

Is it correct to test an Raspian Linux ARMv6 emulator as sudo user?

I have a simple armV6 instruction set C++ program compiled with an ARMV7 compatible arm-Linux-gnueabi-g++ compiler, version 5.3.1, with -march=armv6 and -fPIC on Ubuntu Linux 16.04. After I use PSCP ...
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1answer
68 views

Installing qTox from repository without tee -q0

I wanted to install Tox ( http://tox.chat ) on my Xubuntu 16.04. Main site suggest adding repository this way: echo "deb https://pkg.tox.chat/debian nightly $(lsb_release -cs)" | sudo tee /etc/apt/...
1
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1answer
136 views

How to clean install and dual boot/multi boot windows 10 Ubuntu and Kali?

Okay so I am new to Linux, I recently tried dual booting my laptop (with 1 TB hard-disk and 4 GB RAM which can upgrade upto 16 GB which I am planning to do) with windows 10 and Ubuntu but after ...
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0answers
58 views

wkhtmltopdf and pdfkit issues in python

Hello I am developing an web with python Flask in a linux server, in doing so I am trying to use pdfkit and wkhtmltopdf. I am using a linux server(ubuntu). In Putty, after logging into my server, at ...
2
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2answers
180 views

Mount error when automounting a LUKS-encrypted USB flashdrive

UPDATE 1: userone@desktop:~$ sudo umount "/media/userone/New Volume" umount: /media/userone/New Volume: mountpoint not found userone@desktop:~$ sudo cryptsetup luksClose /dev/mapper/luks-04cb4ea7-...
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0answers
51 views

How to install linux-gpib Python bindings inside virtual environment?

I'm working on developing Python code to control GPIB devices, and am realizing the more I learn the less I know. So here's my question: I believe I've installed linux-gpib properly, and I have ...
0
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1answer
45 views

Wifi and Ethernet unclaimed on ubuntu-based linux

I'm trying to finish the installation of elementaryOS (an Ubuntu-based distribution) on a Thinkpad E460. However, I can't neither have Ethernet nor Wifi. In fact, lshw -c network -sanitize shows both ...
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2answers
33 views

What does %h and other symbols like it mean? [closed]

I have seen % and then some letter for example %h in config files in Ubuntu and in other Linux distributions but I do not know the names of them or what they all do, so I am just wondering if there is ...
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0answers
94 views

Java 8 PPA as dependency for PPA repo?

In launchpad you can add PPA dependency to your PPA packages. I tried to add ppa:webupd8team/java as a dependency to my PPA package, but it doesn't install when I install my package. I also tried ...
0
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1answer
141 views

Ubuntu 16.04, Nvidia driver issues

Ok first off I tried installing the nvidia-current-updates but upon reboot both Unity and Cinnamon crashed. Removed them then tried the official 361-42 drivers. I can login to a desktop but there's ...
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0answers
23 views

cron job quit working after latest apt-get upgrade

I've been running a cron job every 15 minutes for years, with few problems. Sometime in the last week, it quit running, I'm assuming after a apt-get upgrade && apt-get dist-upgrade. I was ...
2
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2answers
33 views

Ouput to a file and read it [duplicate]

I am trying to output the ps command to a file in /home/username/ps.txt. I want to create the file on the go, write the output of ps to it and also read the same in a single command. I tried this: ...
1
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1answer
59 views

Two cronjobs not working (one to start a process, one to stop a process)

I typed the following into crontab -e 0 0 * * * bitcoind -datadir=/home/pi/bitcoinData -daemon 0 6 * * * bitcoin-cli -datadir=/home/pi/bitcoinData stop I expect this to run bitcoind -datadir=/home/...
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2answers
51 views

2.7 Terrabyte Partition only 100G in Size [closed]

I've just partitioned and mounted a new 3-terrabyte hard-disk under Ubuntu. Now the size of the partition shows up as 100G only. lsblk command tells me sdc1 is 2.7 terrabyte root@homecinema-xbmc:~# ...
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2answers
40 views

To Have Eclipse 4.5 in Path?

I downloaded the precompiled Eclipse Mars 4.5 in the official site here. Pseudocode Extract the tarball eclipse-jee-mars-2-linux-gtk-x86_64.tar.gz Move extracted Eclipse directory to some location ...
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0answers
19 views

Resize system partition

I would like to re-size xvda1 to 300G. I am using aws ec2 with Ubuntu 14.04. NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda 202:0 0 300G 0 disk `-xvda1 202:1 0 8G 0 part / xvdb ...
2
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1answer
178 views

Extension “RANDR” missing on xvfb

My system: $lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.3 LTS Release: 14.04 Codename: trusty Xvfb: $ dpkg -s xvfb Package: xvfb ...
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1answer
41 views

Process login vs user login

In a Ubuntu 14.04 system, who has the following output: user1 :0 2016-05-02 14:49 (:0) user1 pts/4 2016-05-02 15:10 (:0) So apparently just the pts/4 is used. But, for example, ...
1
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1answer
44 views

Migrating mounts with identical permissions not working

I have two mounts /mount1 and /mount2. I ran the command: rsync -azrt /mount1/* /mount2/ to clone everything from /mount1 to /mount2. I then altered the /etc/fstab (see below) to remove /mount1 ...
7
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3answers
662 views

Real time cmd tool to show HDD space remaining

Is there a command line tool which shows in real time how much space remains on my external hard drive?
2
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0answers
195 views

Able to ping my host but getting no route to host

I have a elasticsearch service running on MY_HOST_IP(10.x.x.xx) and port 9200. I am able to ping 10.x.x.xx from my VM, but when I try to connect elasticsearch it gives me : no route to host ...
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0answers
31 views

L2tpIPsecVpnControlDaemon critical error

I am currently trying to use l2tp-ipsec-vpn in my ubuntu machine. I followed a guide from tuxfamily to install it. Unfortanely, when I start the system, I got a window with the following error: A ...