sudo apt-get update error duplicate sources.list
5407
How to fix "W: Duplicate sources.list entry"?
103929
sudo apt upgrade error 18.04 (Broken Packages)
133
How can I fix a 404 Error when using a PPA or updating my package lists?
13744
sudo apt-get update failing - "could not open" list file due to "permission denied"
57214
Could not get lock /var/lib/apt/lists/lock
12054
How do I deal with "unauthenticated sources" errors in the Software Center?
991
How can I fix apt error "W: Target Packages ... is configured multiple times"?
19565
Restore default apt repositories in sources.list from command line
46720
sudo apt update error: "Release file is not yet valid"
76905
Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application
21184
Running "sudo apt-get update" returns connection errors
149428
How do I refresh the package list?
49149
How do I solve "Unable to fetch some archives, maybe run apt-get update or try with --fix-missing" error?
119610
500 Internal Server Error whenever I use apt-get
84988
apt-get build-dep is unable to find a source package
135575
How to fix a "Failed to fetch binary-armhf/Packages" error during apt-get update?
90937
apt-get update errors