apt-get update: Signature uses weak digest algorithm (SHA1)
4248
How to fix apt: Signature by key uses weak digest algorithm (SHA1)?
139458
How to download packages from a command-line given repository?
158674
How do I get `apt-get update` to work on a machine with no internet access and manually assigned IP address?
18288
What is the difference between apt and apt-get?
85988
How to set up an apt-cacher server?
63363
apt-key is deprecated
120872
What is apt-cache used for?
90937
apt-get update errors
28000
"GPG error:The following signatures were invalid: KEYEXPIRED"
121946
Problems downloading artifact - error reading signed content
121462
Fixing a broken packet system (apt-get)
145263
“Hash sum mismatch” error due to identical SHA1 and MD5 but different SHA256
113442
apt-get not working on Ubuntu 16.04, problems with kernel packages
82430
SHA1 hash for OSX 10.10 Yosemite public release?
157904
error 503: service unavailable when using apt-get update behind proxy
93574
E: Some index files failed to download. They have been ignored, or old ones used instead after apt-get update
103264
Best way to cache apt downloads on a LAN?