'apt-get update' fails when using proxy
133
How can I fix a 404 Error when using a PPA or updating my package lists?
10985
Using an APT proxy for downloads during installation
97023
Python HTTPS requests (urllib2) to some sites fail on Ubuntu 12.04 without proxy
28650
`apt-get update` cannot find Ubuntu servers
70803
How to setup proxy authentication in the Debian shell?
49149
How do I solve "Unable to fetch some archives, maybe run apt-get update or try with --fix-missing" error?
90937
apt-get update errors
20072
apt-get 403 Forbidden
121462
Fixing a broken packet system (apt-get)
1632
How do I fix a "Failed to download package files" error?
113442
apt-get not working on Ubuntu 16.04, problems with kernel packages
6173
"method driver /usr/lib/apt/methods/https could not be found" update error
44044
apt-get install not work at all
157289
Why use apt-get upgrade instead of apt-get dist-upgrade?
11909
404 error with apt-get update, Don't have any PPA's
105451
apt update: Could not handshake: An unexpected TLS packet was received
82265
Why is apt-get always using proxy, although no proxy is configured?