So I'm trying to upgrade Xubuntu from 20.04 to 20.10, but I get stopped at the beginning with:

```
Checking for a new Ubuntu releaseGet:1 Upgrade tool signature [819 B] 
Get:2 Upgrade tool [1,338 kB] 
Fetched 1,339 kB in 0s (0 B/s) 
authenticate 'groovy.tar.gz' against 'groovy.tar.gz.gpg' 
extracting 'groovy.tar.gz'
Reading cache
Checking package manager
Can not upgrade 
Your python3 install is corrupted. Please fix the '/usr/bin/python3' 
symlink.

```

I did some searching and saw that this can be caused by not having python3 point to the version of python your release originally came from. But mine does (just about).

```
$ /usr/bin/python3 --version
Python 3.8.5

```

Granted it's 3.8.5 and not 3.8.2, but does that little difference matter? Do I actually have to downgrade?

I am using update-alternatives, but 3.8.5 is the only 3.8 installed.

```
$ ls -l /usr/bin/python3
lrwxrwxrwx 1 root root 25 Jun 3 21:21 /usr/bin/python3 -> /etc/alternatives/python3
$ sudo update-alternatives --config python3
There is only one alternative in link group python3 (providing /usr/bin/python3): /usr/bin/python3.8
Nothing to configure.

```

Please advise... thanks!