NO_PUBKEY error when attempting to re-install Ubuntu Software Center
6809
How do I fix the GPG error "NO_PUBKEY"?
111573
What's the best way to re-enable PPAs/repos after an upgrade?
21348
The Software center won't start anymore how to fix it?
5565
How to fix Permission Denied (Public key) error?
48418
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:
78011
Unable to install package post adding ppa
93942
How to fix "Failed to download repository information" error while updating?
11166
"Require Installation Of Untrusted Packages" while upgrading with the update manager
23826
How do I fix a "Unknown configuration key `foreign-architecture' found in your `dpkg' configuration files." error?
102065
How do I rebuild a corrupt dpkg status file?
25651
I lost my software center
43579
I cannot install new packages: "Could not get lock /var/lib/dpkg/lock"
120
How do I restore the default repositories?
1377
Removed Python 3 and now Ubuntu Software Center, terminal and other applications don't work
117852
"Package dependencies cannot be resolved" error when installing software
23286
dpkg: error: dpkg status database is locked by another process
154622
How do I resolve this installation error?