Sources seem to be missing from Discover since upgrading from 19.10 to 20.04

[doomedlung]

Hi everyone,

Since my upgrade, I've just discovered that "Discover" doesn't show any sources to my packages anymore (Check screenshot below). I've checked and re-enabled my packages after upgrading, I see the packages listed in Konsole, when I run

sudo apt update

but Discover just doesn't seem to want to list my packages?

Anyone else experience this? Advice would be much appreciated. Thanks

[claydoh]

What shows in your /etc/apt/sources.list?

[doomedlung]

What shows in your /etc/apt/sources.list?

Hey, yeah sure here you go:

# deb cdrom:[Kubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main multiverse restricted universe

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ focal main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ focal main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ focal-updates main restricted
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ focal universe
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal universe
deb http://gb.archive.ubuntu.com/ubuntu/ focal-updates universe
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://gb.archive.ubuntu.com/ubuntu/ focal multiverse
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal multiverse
deb http://gb.archive.ubuntu.com/ubuntu/ focal-updates multiverse
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
deb http://archive.canonical.com/ubuntu focal partner
# deb-src http://archive.canonical.com/ubuntu focal partner

deb http://gb.archive.ubuntu.com/ubuntu/ focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
deb http://gb.archive.ubuntu.com/ubuntu/ focal-security universe
# deb-src http://security.ubuntu.com/ubuntu focal-security universe
deb http://gb.archive.ubuntu.com/ubuntu/ focal-security multiverse
# deb-src http://security.ubuntu.com/ubuntu focal-security multiverse

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

[jglen490]

You have everything you need. See if those repos show up in Muon and/or Synaptic.

[jlittle]

/etc/apt/sources.list

...
deb-src http://gb.archive.ubuntu.com/ubuntu/ focal main restricted
...
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-updates main restricted
...
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal universe
...
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-updates universe
...
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal multiverse
...
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-updates multiverse
...
# deb-src http://gb.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse

That looks odd. There's one source repository enabled, but the rest aren't. I suggest removing the "# " from all the deb-src lines.

[doomedlung]

Hmmm not sure I should do that as the source repos were originally commented out. Anyway I've tried removing the comments from the deb-src entries and still nothing?

[jlittle]

Uncommenting the deb-src lines manually once was standard procedure. Later, using software-properties from muon has exactly the same effect.

and still nothing?

Did you run sudo apt update? The sources.list file is only read then.

[Snowhog]

Discover doesn't show the sources list information IF no updates are available, at least, that is my experience. I don't like Discover; prefer Muon Package Manager, which isn't installed by default (?). If it isn't installed, do so. Open a Konsole and type: sudo apt update && sudo apt install muon

After it's installed, launch Muon Package Manager. Check settings from there.

[jglen490]

If the source list does not show up in Discover, but it does show up in Muon and/or Synaptic, there may be reason to file a bug report on Discover. Your sources exist, they should should show up in Discover, Muon, and Synaptic, and if they don't it's a problem.

[doomedlung]

As previously stated when I run sudo apt update, my sources are listed but not in Discover. However, as per the advice I have Muon and my sources are listed as expected. Honestly, I quite like using Discover and would like to know how to fix this as prior 20.04 my sources were listed in Discover.. just a PITA, since everything else is working as expected and to launch Software Sources, I have to launch Driver Manager to amend my Release Upgrade settings.. I'll probably file a bug then since this seems to be something that isn't fixable with some of the mentioned solutions.

Whats the process for filing bugs? Any pointers would be much appreciated.

Cheers in advance

[Snowhog]

In Muon Package Manager, Settings > Configure Software Sources > Updates what do you have for Automatic updates > Check for updates:

[Schwarzer Kater]

Another possibility would be to delete the caches and settings of Discover in your /home-directory - this will do no harm if it doesn't work:

1. Quit Discover.

2. Either use Dolphin, go to your /home, show hidden files and folders and delete .cache/discover and .config/discoverrc
or
open a Konsole terminal window and

$ rm -R .cache/discover .config/discoverrc

3. Start Discover and see if anything has changed.

[doomedlung]

Another possibility would be to delete the caches and settings of Discover in your /home-directory - this will do no harm if it doesn't work:

1. Quit Discover.

2. Either use Dolphin, go to your /home, show hidden files and folders and delete .cache/discover and .config/discoverrc
or
open a Konsole terminal window and

$ rm -R .cache/discover .config/discoverrc

3. Start Discover and see if anything has changed.

No, this didn't work, sources still not listed.

[doomedlung]

In Muon Package Manager, Settings > Configure Software Sources > Updates what do you have for Automatic updates > Check for updates:

I have the following:

[Snowhog]

Because you have "Install security updates without confirmation", downloading/updating of existing installed packages is happening 'behind the scenes', and you aren't aware that it is happening. Change it to "Only notify about available updates" instead.