Can't get anything from http://archive.ubuntu.com

[DataMan]

Are you behind a proxy server?

[DrHu]

Whenever I try to install something from http://archive.ubuntu.com, I get this error
...
W: Falha ao obter http://archive.ubuntu.com/ubuntu/pool/u ... fs-config/ntfs-config_0.5.5-0ubuntu3_i386.deb

I don't find it in your link, but I see it here if I search for that file name on the internee
http://ftp.u-picardie.fr/pub/mirror/lin ... fs-config/
Sorry, yes your link worked as well, I can see it under /n/ntfs-config, both the link I searched for and your has the same files..

resolver 'archive.ubuntu.com'
Anyway, the problem in your message is a failure to resolve the domain name (dns name to IP address)
--so, you will have to reheck your network settings
In terminal

• cat /etc/resolv.conf
  # Generated by NetworkManager
  domain gateway.name
  search gateway.name
  nameserver 192.x.x.x
  

netstat -rn
ifconfig or iwconfig or iwlist for wireless networks
--You could also use traceroute to trace your network connections to either an IP address or dns name..
apt search traceroute
i traceroute - Traces the route taken by packets over an