what does Package has no installation candidate mean?
3523
What does "Package  has no installation candidate" mean?
2166
python pip: no distributions at all found for an existing package
115722
Apt sources.list problem , packages not found?
122742
Why does apt-get install a newer dependency than supported by the specified package
30588
Unable to locate package
30754
Cannot update: "No available releases found"
8780
How can I find out in which distributions a package is available?
98585
How to check if installing a package will require a reboot?
153810
"Untrusted packages could compromise your system's security" appears while trying to install anything
118543
How can I install a package without installing some dependencies?
91210
Why does Ubuntu only support versions for a limited time (and what does it mean)?
134780
Is there a Yum Option that Creates an Error if a Package is Missing?
44991
A lot of missing dependencies when I try to install all software
1632
How do I fix a "Failed to download package files" error?
65
What can I do if a repository/PPA does not have a Release file?
16186
Requires installation of untrusted packages?
30304
Shows "unable to locate package unzip" error