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18
votes
0answers
1k views

Best practice to customize date/time format system-wide?

I'd like to customize exclusively the date and time format for my system, while sticking to the rest of the locale as is. I know that environment variable LC_TIME will make it possible to customize ...
14
votes
1answer
14k views

Attempting to compile kernel yields a certification error

I'm currently attempting to follow this guide in order to install the 4.5.7 kernel with Grsecurity on my Kali Linux desktop. I am following that list of instructions verbatim, except for the fact ...
14
votes
1answer
4k views

How do I take a screen shot of my Xvfb buffer?

I'm using Amazon Linux. I want to run a headless chromium browser to use on my node.js Selnium tests. So I fire up my Xvfb server like so ... if ! pidof /usr/bin/Xvfb; then Xvfb :0 -screen 5 ...
14
votes
1answer
3k views

How to modify the default setting adopted by xrandr when connecting an external monitor?

I am confronted with a problem when connecting the external monitor while the computer is open. At that point it seems that xrandr adopts one of the combinations that do not work. As a workaround to ...
14
votes
3answers
3k views

Mutt: Automatically subscribe to IMAP mailboxes

I'm using a bunch of mailboxes in mutt which are populated by imapfilter. To avoid manual reconfiguration (by going to the folder list and pressing s at every new entry), I'd like to configure mutt to ...
13
votes
1answer
1k views

gnome-keyring usage without an x session

My use case is that I have a headless server that software development is performed on. I ussually enable X11 forwarding for the SSH connections to it, but I can't for distant locations with slow ...
13
votes
1answer
821 views

How can I minimise all GNOME/Wayland windows from the command line?

Before switching to Wayland I would minimise all GNOME Shell windows with the following command: wmctrl -k on ...but both wmctrl and xdotool are X11-only applications. What CLI command can I use to ...
13
votes
2answers
3k views

Lenovo T440s battery status unknown, but charging?

I'm trying to configure my Lenovo on arch linux. The last thing I need to do is get the battery 100% working. Right now it appears that the main battery's state is unknown: ...
13
votes
0answers
4k views

How to disable sudo related logging for successful command execution under CentOS/Fedora?

You can disable sudo related log messages via adding something like Defaults:juser !syslog to the sudoers file. That will disable logging to syslog. But under e.g. CentOS/Fedora there is an auditd ...
13
votes
1answer
2k views

Wget: convert-links and avoid redownloading already fetched files?

I am downloading data spread among multiple files that don't change once published. Therefore --timestamping is not good enough, because it is constantly checking whatever resource is changed, which ...
12
votes
1answer
843 views

Numpad emulation

My new laptop (Dell Inspiron 5578) has no numeric pad. Many laptops without dedicated numpad keys have numpad accessible through Fn, but not this one. When I run xev and try to use traditional Fn ...
12
votes
1answer
1k views

ACPI group/action undefined: processor / LNXCPU

If I unplug my laptop from the AC adapter, I will get ACPI errors like these: May 07 21:45:04 veritas root[7067]: ACPI group/action undefined: processor / LNXCPU:00 May 07 21:45:04 veritas root[7076]:...
12
votes
0answers
562 views

Why does my terminal letter-spacing decrease when I disable a display return from using /dev/tty?

I've got a curious hardware situation, and I've run into a curious software quirk. I have a laptop with a broken screen that I have hooked up to an external display. I start up an X session and open a ...
12
votes
0answers
804 views

Why ZFS scrub does not complete?

First off let's start with what I'm running. This is a home media server running Ubuntu 16.10. I have one pool of mirrored 6 terabyte drives that are about half full. I built the system about a month ...
12
votes
2answers
3k views

Gnome stop grabbing my emacs keys

I am using Gnome in Ubuntu 11.04. I work a lot in Emacs, and I find that the Gnome window manager grabs some of the Emacs keys. To some extent, I can stop this by laboriously going through each of ...
11
votes
1answer
807 views

zsh can't input to terminal when piping stdin and stdout with variable command that has tty output

System info: macOS Sierra 10.12.6 zsh 5.4.2 (x86_64-apple-darwin16.7.0) GNU bash, version 4.4.12(1)-release (x86_64-apple-darwin16.3.0) Scroll to the EXAMPLES at the bottom if you just want to dig ...
11
votes
0answers
2k views

Overriding gtk3 theme colors

I'd like to achieve something I thought would take a couple of seconds and turns out to be a nervous breakdown: override a theme's selected item color in a GTK3 theme. At first, I naively though that ...
11
votes
2answers
2k views

Let's Encrypt - Apache - OCSP stapling

I would like to enable OCSP stapling in my Apache server. I'm using: Server: Apache/2.4.7 on Ubuntu Certificate: Let's Encrypt To the file: /etc/apache2/sites-available/default-ssl.conf I added: ...
11
votes
2answers
12k views

How do I change the verbosity of the service command?

I am running Kali 2 Linux. I use the systemctl or service command to start a service such as Apache. On the previous version of Kali the command actually prints an "OK" message when starting a ...
11
votes
1answer
1k views

Replace an image in a PDF using command line

I need to process some PDF files. The task consists in exchange a given image file by another. My first problem is how to replace a PDF image from command line in a batch process. Next I'll try to ...
11
votes
0answers
5k views

Graph is too large for cairo-renderer bitmaps Error

Im trying to use pyreverse to generate images of UML diagrams for a project source code. When I run the pyreverse command and specify to generate .png images, it runs and then after a while, it shows: ...
10
votes
0answers
837 views

wpa_supplicant end process if wrong password detected

Normally when I run wpa_supplicant I'll get some output like this: Successfully initialized wpa_supplicant ioctl[SIOCSIWAP]: Operation not permitted ioctl[SIOCSIWENCODEEXT]: Invalid argument ioctl[...
10
votes
0answers
593 views

What are the costs of increasing `/proc/sys/fs/inotify/max_user_watches` value?

In order to watch my home directory and all subdirectories recursively for 60 seconds: $ inotifywatch -v -r -t 60 /path You may get Failed to watch /path; upper limit on inotify watches reached! ...
10
votes
0answers
275 views

How to increase sound volume on eMac P69 running FreeBSD 10.3?

I've got FreeBSD 10.3 (PowerPC) installed on eMac P69. I'm using MPlayer to test loudness. I already use -af volume=10:1-like options but they tend to distort sound pretty quickly + it is not really ...
10
votes
2answers
2k views

Resetting bluetooth on Archlinux

Sometimes it happens that my bluetooth mouse gets disconnected from my laptop. Switching off/on the mouse doesn't help. Switching off/on my laptop bluetooth doesn't help either. Not even systemctl ...
10
votes
2answers
663 views

Emacs slow loading time with AUCTeX on TeX files

I installed the auctex and emacs packages on two Xubuntu 14.04 computers, both of which have been working fine. Emacs itself works fine on both, but now with the auctex package installed, when I load ...
10
votes
2answers
5k views

Problem Installing UBUNTU 14.04 (AND Mint 16, which is based on UBUNTU 13.10) as dual boot on RAID 0 with Windows 8.1

Ok, I know that there is https://askubuntu.com/questions/455511/dual-boot-ubuntu-14-04-and-windows-7-on-fakeraid-installation-error-question-m#new-answer?newreg=f2b8bde40c8947f8ac8e3cedec0d1964 and ...
10
votes
2answers
1k views

AP randomly gets unreachable for the clients while hostapd is running

I set up an old PC as a router using Debian Wheezy, hostapd, dhcpd etc. It has 3 NICs and 1 WiFi PCI card (TP-Link L-WN751ND). The problem is that AP randomly gets unreachable for the clients while ...
10
votes
3answers
350 views

How to disable trackpad taps in Yellow Dog Linux?

I just installed Yellow Dog Linux 6.2 on an old PowerPC laptop. By default, it's interpreting trackpad taps as clicks, which I want to disable. I followed the directions here, and put TRACKPAD_OPT=...
10
votes
2answers
2k views

Benefiting of sched_autogroup_enabled on the desktop

I am running a 2.6.37 kernel with sched_autogroup_enabled set to 1. I am not certain that I am seeing the benefits of this patch since: I am launching my applications from the desktop; applications ...
10
votes
1answer
4k views

nvidia-smi hangs indefinitely: what could be the issue?

I try to run nvidia-smi from the shell on a machine, but it hangs indefinitely: what could be the issue? Update (2016-08-09): Since this question received no answer, I crossposted it: https://...
10
votes
1answer
2k views

How can I calibrate Zathura's zoom levels to my monitors?

I'm using Zathura (using the MuPDF plugin) to review various layouts for printing. It's important to me that I'm looking at things approximately the same size as they will come out on paper. I realize ...
9
votes
2answers
1k views

Whenever ansible makes changes to sshd in CentOS7 a random future play cannot connect

This has been an irritating enough problem now that I thought I would finally ask the community at large what a possible solution might be. It's even more irritating that I seem to be the only one ...
9
votes
1answer
498 views

How to format & mount a large partition with 4k sector size in Freebsd?

gpart show -l: => 6 146239733 da0 GPT (558G) 6 10 - free - (40K) 16 128 1 (null) (512K) 144 262144 2 efi (1.0G) ...
9
votes
2answers
3k views

Microphone volume on USB soundcard very low, snd_usb_audio options?

I have a C-Media USB soundcard installed on my Raspberry Pi: Bus 001 Device 004: ID 0d8c:0008 C-Media Electronics, Inc.. It is a USB cable with an XLR end on the other side, to which I have an XLR ...
9
votes
0answers
835 views

Sharing unix sockets across unprivileged lxcontainers

I have two unprivileged containers and I'd like to share a unix socket between them. Each container has its own user on the host, complete with separate subuid and subguid mappings. I've tried ...
9
votes
0answers
547 views

User-based GPU priority

I have a computer running Linux (Kubuntu 14.04.3 LTS x64), where I use the CUDA toolkit to perform some computations on some Nvidia GPUs. I share the computer with a few other users. How can I define ...
9
votes
1answer
1k views

curl request to IPv6 localhost gets stuck

A docker container of mine exposes a HTTP interface on port 8500, which is mapped to host port 8500. It is not IPv6 enabled. This still means, I should be able to access it at localhost:8500. IPv6 ...
9
votes
1answer
2k views

How to print from Arch Linux via Wi-Fi to Canon MG6450?

I have a Canon MG6450 with Wi-Fi enabled and an up-to-date Arch Linux installation with cnijfilter-mg4200 3.80-1 installed. I can see the printer in print dialogues (sometimes it takes a second to ...
9
votes
1answer
2k views

Real GNOME Wayland session

I'm trying to test a "real" wayland gnome session. I know that not all applications can run on Wayland natively (for this we have XWayland) but at least I would like to have GTK+ applications to do so....
9
votes
1answer
2k views

How to display btrfs subvolume tree?

Is there a way to make a btrfs subvolume tree like what is shown below? (Only subvolumes - no regular directories or files.) # tree /mnt/1 /mnt/1 ├── a ├── snapshot │ ├── a │ └── subv └── subv ...
9
votes
2answers
3k views

Automatically switch sound output device to Bluetooth headset & force to A2DP profile on connection

Using Mint 17 + MATE here. My bluetooth headset (Plantronics Backbeat Go2) is connected just fine with my system, but there are several manual steps I have to take to make this work that I would very ...
9
votes
1answer
1k views

How do I refresh the Google calendar in Gnome?

I'm using Gnome 3.14 on Arch Linux. I'm fond of the calendar drop-down when you click on the time in the top panel. I've set up my Google calendar to show there, but if I happen to be offline when ...
9
votes
1answer
803 views

How to manage multiple panel layouts for different display setups in KDE?

I use my laptop in 3 display setups: laptop only laptop + monitor laptop + projector For each one I use different screen setup and panel layout. It's quite boring to modify layout after each display ...
9
votes
0answers
877 views

What does hierarchy support do in cgroup?

cgroup has 2 options for memory control: memory.use_hierarchy = 1 : use hierarchy memory.use_hierarchy = 0 : use flat hierarchy, according to this answer What is the difference between the two? I ...
9
votes
2answers
579 views

Mailman / Postfix Configuration Assistance

I am writing for some help regarding Postfix configuration. I cannot seem to get Postfix configured properly to transfer mail to the mailing list installed on the same server. I followed many steps ...
9
votes
1answer
1k views

How can I configure Yast to switch languages completely?

I have an installation of openSUSE 11.4 which was installed in German. I started Yast2 (which displayed in German, like "Netzwerkdienste") and switched the language to English under "System" -> "...
9
votes
1answer
5k views

“nl80211: 'nl80211' generic netlink not found” when starting hostapd

I have been trying to get my Ubuntu 11.10 laptop to make an access point to connect my blackberry playbook . hostapd gave error Configuration file: ./hostapd-minimal.conf nl80211: 'nl80211' ...
9
votes
1answer
308 views

Diacritics do not work in GTK+ applications running on Mac OS X Snow Leopard

I am using some GTK+ applications in Mac OS X Snow Leopard. My MacBook is configured for using the Brazilian layout, which allows it to enter diacritics as dead keys (so I can write á typing ' and ...
9
votes
3answers
397 views

How can I disable the poweroff and reboot button in sddm on Debian?

What I tried: I created the file /etc/sddm/sddm.conf (also tried /etc/sddm.conf) with the following content: [General] HaltCommand=true RebootCommand=true Unfortunately, that did not help - the ...

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