Duplicate source error on apt-get update
5407
How to fix "W: Duplicate sources.list entry"?
21382
What does "sudo apt-get update" do?
43917
What is the difference between apt-get update and upgrade?
156977
Unable to install files with apt-get: "unable to locate package"
84803
sudo apt get update gives error - The package cache file is corrupted
1520
How to install software or upgrade from an old unsupported release?
53588
How do remove the CD / DVD install as a source for apt-get packages when installing new features?
76905
Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application
94228
What commands (exactly) should replace the deprecated apt-key?
64509
Can't update from official repositories [Error 409]
122588
Can't connect to ubuntu archive when using apt-get update
157904
error 503: service unavailable when using apt-get update behind proxy
87672
Apt-Get system completely broken. possible to completely reinstall it?
113145
What does 'apt-get install update' do?
59119
apt-get, unmet dependencies, ... "but it is not going to be installed"
21789
What does 'Ign' , `Get` or 'Hit' mean when running an apt-get update?
40885
What should I do when I got the KEYEXPIRED error message after an apt-get update?