Ошибки при обновлении. Временное разрешение Faliure на archive.ubuntu.com [дубликат]

Вот вывод apt update:

$ sudo apt update
[sudo] password for dmdkb5: 
Err:1 http://in.archive.ubuntu.com/ubuntu focal InRelease                   
  Temporary failure resolving 'in.archive.ubuntu.com'
Err:2 http://security.ubuntu.com/ubuntu focal-security InRelease            
  Temporary failure resolving 'security.ubuntu.com'
Err:3 http://in.archive.ubuntu.com/ubuntu focal-updates InRelease           
  Temporary failure resolving 'in.archive.ubuntu.com'
Err:4 http://in.archive.ubuntu.com/ubuntu focal-backports InRelease
  Temporary failure resolving 'in.archive.ubuntu.com'
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/focal/InRelease  Temporary failure resolving 'in.archive.ubuntu.com'
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/focal-updates/InRelease  Temporary failure resolving 'in.archive.ubuntu.com'
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/focal-backports/InRelease  Temporary failure resolving 'in.archive.ubuntu.com'
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/focal-security/InRelease  Temporary failure resolving 'security.ubuntu.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

Как и в выводе, у меня Ubuntu 20.04 LTS.