Can't install vlc and other software : packages not coming from authenticated sources
1520
How to install software or upgrade from an old unsupported release?
32426
How to install packages?
110670
Problem while installing vlc player
26308
How to solve "Unable to find expected entry 'restricted/binary-1386/Packages' Wrong sources.list entry or malformed file"?
117852
"Package dependencies cannot be resolved" error when installing software
4450
How can I reproduce the error "package... needs to be reinstalled, but I can't find an archive for it" for testing?
16707
How do I install VMware Player 4.0.3 (and patch the installer to work on my 12.04 system)?
47808
"The following packages were automatically installed and are no longer required:" what to do?
43056
"Can't cd to /home/user" when sourcing a script
3523
What does "Package  has no installation candidate" mean?
48896
Can't play DVDs through either VLC, Videos, or Kaffeine
34912
Why are the two versions of Chromium and VLC available in Ubuntu software of different sizes?
4853
Trouble downloading packages list due to a "Hash sum mismatch" error
2280
Package system is broken. How to fix it?
16186
Requires installation of untrusted packages?
44991
A lot of missing dependencies when I try to install all software
153810
"Untrusted packages could compromise your system's security" appears while trying to install anything