Backport PR #16308 on v3.2.x: CI: Use Ubuntu Bionic compatible package names#16332

timhoffm wants to merge 1 commit intomatplotlib:v3.2.xmatplotlib/matplotlib:v3.2.xfrom

timhoffm:auto-backport-of-pr-16308-on-v3.2.xtimhoffm/matplotlib:auto-backport-of-pr-16308-on-v3.2.xCopy head branch name to clipboard