Please check which version of python3.10 you have installed currently:
$ apt-cache policy
If you still have 3.10.6-1+focal1, then the PPA packages have not been purged yet, in which case you should try:
$ apt purge python3.10
Please check which version of python3.10 you have installed currently:
$ apt-cache policy
If you still have 3.10.6-1+focal1, then the PPA packages have not been purged yet, in which case you should try:
$ apt purge python3.10