0

I'm using Lubuntu 19.10.  The problem is I can't find the Wi-Fi network (Wi-Fi is enabled in nm-tray).  Then I tried to check my drivers, but when I go to "Preferences" → "Additional Drivers" I get this message:

          LXQt sudo
Child 'sudo' process failed!    
sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

screenshot containing above error window

I cannot even see available Wi-Fi networks.  I tried to see iwconfig in Terminal but I see the same error.

I have USB tethering via mobile phone but I'm not able to have my phone connected to the computer all the time.

Improve this question
2
  • Please edit your question to tell us what you did before: the error message indicates that you seem to have changed permissions of (at least) /usr/bin/sudo
    – guntbert
    Commented Jul 25, 2020 at 20:35
  • I didn't edit anything before this, it's fresh Lubuntu installation ...
    – Loser300
    Commented Jul 25, 2020 at 20:38

1 Answer 1

Reset to default
1

First, I'd like to point out that Lubuntu 19.10 is EOL, meaning no longer supported. You should upgrade to 20.04, the current LTS, or downgrade to 18.04 which is also a LTS release.

But, the problem here is that someone has changed the permissions for /usr/bin.

To fix this, you need to take ownership (and change the permissions) of the directory and files.

Open your terminal and enter the following:

chown root:root /usr/bin
chmod u+s /usr/bin/sudo

And that should solve your problem. This assumes this is the only symptom. If you've changed the permissions for multiple directories, there will be more work involved.

Improve this answer
7
  • The lubuntu.net domain is not the real Lubuntu site. That's lubuntu.me. To go to the official pages, when you don't already know, you should use this link and follow the links from there. Either way, the solution above should get you squared away with your sudo issue and you can work your way from there to get your wifi issues resolved.
    – KGIII
    Commented Jul 25, 2020 at 20:53
  • I tried your commands, but no responses given in Terminal. When I add 'sudo' before your commands, it gives me the same error: usr/bin/sudo must be owned by uid 0 and have the setuid bit set I downloaded Lubuntu 19.10 from lubuntu.net, there it says the latest version is 19.04 I've just realised that there is lubuntu.me website, sorry! I'm just downloading from lubuntu.me (version 20.04) ...
    – Loser300
    Commented Jul 25, 2020 at 20:54
  • Yeah, let's go that route. It'll be much easier - and probably faster. Grab the latest 20.04 (like you're doing now) ISO and re-install. When you're doing the installation, you can pick 'something else' (during the partition stage) and it will let you just install it over the existing install while preserving /home. Otherwise, backup /home (if you have anything you want to keep) and just copy it back to the new install.
    – KGIII
    Commented Jul 25, 2020 at 21:01
  • Thank you! While installing do I need to select mounting point to: / or /home or /bin ?
    – Loser300
    Commented Jul 25, 2020 at 22:24
  • Just the / should do it. Backup /home if there's anything in there you want to keep. If there's nothing you want to keep then just go ahead and wipe the disk and do a full install.
    – KGIII
    Commented Jul 25, 2020 at 22:35

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .