Ubuntu 19.04 incorrect sources.list
19565
Restore default apt repositories in sources.list from command line
19749
How to debug an unmet dependencies problem?
35318
How do I list the default installed packages?
52190
How and when is old-releases.ubuntu.com updated?
24858
How do remove "Ignoring file in directory /etc/apt/sources.list.d/ as it has an invalid filename extension?
83445
Missing "References" heading
135393
Why does Ubuntu Software Center not show every package available?
15281
How to get a complete list of all applications installed?
34529
Files list file for package missing -- dpkg warning
119943
Where can I find a repository for older unsupported releases?
1899
How can I modify the list of Applications under 'Open With...'?
125728
Unable to locate Source XRef to link to
115722
Apt sources.list problem , packages not found?
13744
sudo apt-get update failing - "could not open" list file due to "permission denied"
35160
Invisible software updates list in Software Updater
48988
Massive overlap between sites regarding Linux
72596
Where are the logs for apt-get?