Unable to use sudo apt-get update: "NO_PUBKEY 26EB39123AAAAA96"
6809
How do I fix the GPG error "NO_PUBKEY"?
26745
Skipping acquire of configured file 'contrib/binary-i386/Packages' as repository ... doesn't support architecture 'i386'
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
127668
"Unable to locate package sudo" when i try to install sudo on new Debian
84309
How to resolve E: Internal Error when using apt-get remove?
90937
apt-get update errors
64509
Can't update from official repositories [Error 409]
13720
apt-get update fails to fetch files, “Temporary failure resolving …” error
135575
How to fix a "Failed to fetch binary-armhf/Packages" error during apt-get update?
127895
403 Forbidden error in sudo apt-get upgrade ubuntu 17.4
97588
sudo apt-get 'NOSPLIT Error'
16578
How to upgrade a single package using apt-get?
157904
error 503: service unavailable when using apt-get update behind proxy
133
How can I fix a 404 Error when using a PPA or updating my package lists?
12534
14.04 --> 16.04 failed; apt (>= 1.0.1ubuntu2.13)' is not installed
145400
Error when trying sudo apt-get update - Python related?
103929
sudo apt upgrade error 18.04 (Broken Packages)