Repository does not have a Release key and public key
6809
How do I fix the GPG error "NO_PUBKEY"?
112879
W: The repository 'http://download.fpcomplete.com/ubuntu yakkety Release' is not signed
511
How to enable silent automatic updates for any repository?
24165
Upgrade to version newer than repositories
131474
How to only install updates from a specific repository?
58759
How to fix missing GPG keys?
154758
repository element was not specified in the POM inside distributionManagement element or in -DaltDep loymentRepository=id::layout::url parameter
46419
The repository 'http://dl.google.com/linux/chrome/deb stable Release' does not have a Release file
62855
sudo add-apt-repository throws an exception
104906
Unable to connect to repository in MiKTeX 2.9
20472
How do I enable the "partner" repository?
46424
Cannot update software center repositories
51350
While updating the ubuntu 16.04 does not have a Release file Error
8525
Error Updating: izx/askubuntu/ubuntu xenial Release' does not have a Release file
1538
How to erase duplicate repository?
4945
How do I enable the "Universe" repository from the command line?
130650
E: The repository 'http//archive.canonical.com precise Release' is not signed