GPG error KEYEXPIRED when using sudo apt-get update (Ubuntu 15.04)
6809
How do I fix the GPG error "NO_PUBKEY"?
21184
Running "sudo apt-get update" returns connection errors
121983
gpgkeys: key C927EBE00F1B0520 not found on keyserver
78788
How to renew an expired keypair with gpg
21483
no such file or directory 'authorized_keys'
13720
apt-get update fails to fetch files, “Temporary failure resolving …” error
60351
How can I update to a newer version of Git using apt-get?
48418
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:
20398
dpkg broken after 15.04 upgrade fail
94228
What commands (exactly) should replace the deprecated apt-key?
79330
what does "sudo apt-get install aptitude" do?
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
23286
dpkg: error: dpkg status database is locked by another process
17208
What does this apt error message ("Download is performed unsandboxed as root...") mean?
90937
apt-get update errors
150033
E: Sub-process /usr/bin/dpkg returned an error code (1) for almost all updates
7583
How can I adjust the default passphrase caching duration for GPG/PGP/SSH keys?