Unable to use sudo apt update
2694
How do I remove a malformed line from my sources.list?
15413
sudo apt update always giving Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
4124
I cannot run apt update properly - apt update hangs
80258
Unable to open any graphical app with "sudo"
88391
command not found when using sudo
107009
ubuntu 18.04 apt-get upgrade problem "redirection loop encountered."
46720
sudo apt update error: "Release file is not yet valid"
12534
14.04 --> 16.04 failed; apt (>= 1.0.1ubuntu2.13)' is not installed
113379
Updating the repository isn't working
71830
How to fix "sudo: unable to open ... Read-only file system"?
73973
After typing "apt-get update" terminal says Could not open lock file
1520
How to install software or upgrade from an old unsupported release?
103069
How to fix 'sudo: no tty present and no askpass program specified' error?
144507
No facility exists in Update Manager to upgrade to a new version, why?
65099
Unable to install any updates through update manager/apt-get upgrade
105770
Cannot use apt-get/dpkg -- Input/output error
85009
`apt update` failed on Debian Linux