Ubuntu 18.04 The repository 'http://ppa.launchpad.net/docky-core/ppa/ubuntu bionic Release' does not have a Release file
65
What can I do if a repository/PPA does not have a Release file?
104628
How can I build for release/distribution on the Xcode 4?
88329
Canonical replacing Unity with gnome-shell in Ubuntu 18.04 what now?
74838
Lost/Deleted dpkg (package manager for Debian). How do I get it back?
98636
What's the difference between a PPA and a repository?
98450
How to install build-essential?
78011
Unable to install package post adding ppa
59768
How do I enable the "multiverse" repository?
43698
How does the PPA fit into the scenario of publishing an application to the Ubuntu Software Center?
31506
How do I update Ubuntu manually?
134786
Why doesn't Ubuntu ship an application, or the latest versions of some applications?
48418
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:
20472
How do I enable the "partner" repository?
31892
New "Ubuntu Software" not working (16.04)
13107
How to install updates via command line?
110896
Package installation - Outdated repository
66285
Package repository down, how to relocate?