Software updater warning: requires installation of untrusted packages
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
5242
How to update software installed via .deb file
158791
Bogus message from automatic updates
90822
How can I install just security updates from the command line?
155918
What information do I need to solve an APT dependency issue?
1771
How to get rid of 'security updates available' warnings?
43579
I cannot install new packages: "Could not get lock /var/lib/dpkg/lock"
10633
software updater failed to download repository information
1632
How do I fix a "Failed to download package files" error?
44991
A lot of missing dependencies when I try to install all software
151656
Installing from source. How to resolve dependencies without destroying the package manager
3298
How do I resolve unmet dependencies after adding a PPA?
76165
Unmet dependencies: not configured yet
13107
How to install updates via command line?
84537
Using dpkg to install upgrade and dist-upgrade packages
138044
How can I stop the Software Updater from nagging me to restart?
134192
How to make sure I'm not using any proprietary software after installation?