"Unable to locate package ubuntu-restricted-extras"
11671
"Unable to locate package" while trying to install packages with APT
29326
Can't install a package due to "Something wicked happened resolving" error
115722
Apt sources.list problem , packages not found?
3523
What does "Package  has no installation candidate" mean?
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
16736
"The following packages have been kept back:" Why and how do I solve it?
22624
Unable to locate package kubuntu-plasma5-desktop on 14.04
32220
How to resolve Unmet dependencies error?
136463
I am trying to install package fetch
12773
The requested package is unknown
74763
Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution)
130128
npm installed packages are not accessible
64546
How to forbid a specific package to be installed?
32426
How to install packages?
30645
How to install (old) packages for Ubuntu 9.04?
1520
How to install software or upgrade from an old unsupported release?
18052
How to remove/install a package that is not fully installed?