Terminal displays strange characters instead of prompt after upgrade from Xununtu 18.04 to 20.04
Solution 1:
Delete your ~/.cache/fontconfig and generate the fontcache again:
rm -rf ~/.cache/fontconfig
fc-cache -r -v
That most likely will help. If not, there is a problem with the systemwide installed font files.
- Check in the terminal preferences what font is in use for the terminal
- Purge and reinstall that font, or try a different font
Actually, after an upgrade, do not hesitate to fully wipe the ~/.cache folder. It is cache, i.e., files aimed for speedier loading, and will be recreated as you continue to use the updated system.