Example:

https://github.com/python/cpython/pull/19375/checks?check_run_id=561058404
of https://github.com/python/cpython/pull/19375

The Install Dependencies step failed with:

 sudo ./.github/workflows/posix-deps-apt.sh && sudo apt-get install wamerican
(...)
Err:1 http://azure.archive.ubuntu.com/ubuntu bionic/universe amd64 lcov all 1.13-3
  Could not connect to azure.archive.ubuntu.com:80 (52.177.174.250), connection timed out [IP: 52.177.174.250 80]
Err:2 http://azure.archive.ubuntu.com/ubuntu bionic/main amd64 libgdbm-dev amd64 1.14.1-6
  Unable to connect to azure.archive.ubuntu.com:http: [IP: 52.177.174.250 80]
(..)
Err:15 http://azure.archive.ubuntu.com/ubuntu bionic-updates/main amd64 uuid-dev amd64 2.31.1-0.4ubuntu3.6
  Unable to connect to azure.archive.ubuntu.com:http: [IP: 52.177.174.250 80]
Get:5 http://security.ubuntu.com/ubuntu bionic-updates/main amd64 libsqlite3-dev amd64 3.22.0-1ubuntu0.3 [632 kB]
Fetched 632 kB in 1min 1s (10.5 kB/s)
E: Failed to fetch http://azure.archive.ubuntu.com/ubuntu/pool/universe/l/lcov/lcov_1.13-3_all.deb  Could not connect to azure.archive.ubuntu.com:80 (52.177.174.250), connection timed out [IP: 52.177.174.250 80]
E: Failed to fetch http://azure.archive.ubuntu.com/ubuntu/pool/main/g/gdbm/libgdbm-dev_1.14.1-6_amd64.deb  Unable to connect to azure.archive.ubuntu.com:http: [IP: 52.177.174.250 80]
(...)
E: Failed to fetch http://azure.archive.ubuntu.com/ubuntu/pool/main/u/util-linux/uuid-dev_2.31.1-0.4ubuntu3.6_amd64.deb  Unable to connect to azure.archive.ubuntu.com:http: [IP: 52.177.174.250 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
##[error]Process completed with exit code 100.

I wonder why the "install wamerican" didn't go into the script? It should at least get the same options as in the script to make sure it doesn't break the install.

Maybe we should make our own mirror of Ubuntu so that we don't have to depend on a massive company with billions of users to get it right for us? :o)

I didn't see the issue recently. Moreover, Brett asked me to report Azure issues to https://github.com/python/core-workflow/ instead. So I close this issue.