What does "skipping forcibly removed package xxx" mean? Should I care about it?

Meaning: this package is referenced as dependency in one of the collections, but not present. This can normally only happen by calling tlmgr remove --force. Sometimes when a tlmgr run is interrupted similar things might occur.

Fixing: To fix the problem you can run

tlmgr install <package>

to reinstall a single package or

tlmgr update --all --reinstall-forcibly-removed

to reinstall every forcibly removed package, or use the GUI.

Background: package dependencies are tracked but not enforced once broken, that is we allow users to remove packages even if they are referenced somewhere. Normally there is no need for that, though.

Reinstall previously removed packages check box must be selected to solve this problem. Then press update all installed button.