Ubuntu 16.04 environment was removed from GitHub in September. The job for the 7.8 branch now always fails with time out. It also seems like a good idea to support only last two Ubuntu LTS versions.
@@ -43,7 +43,6 @@ jobs:
strategy:
matrix:
os:
- - ubuntu-16.04
- ubuntu-18.04
- ubuntu-20.04
fail-fast: false