Ваша установка python3 повреждена Исправьте символическую ссылку '/ usr / bin / python3' [дубликат]

Я пытаюсь обновить Ubuntu 18.04 до 20.04, но когда я запускаю do-release-update , я получаю сообщение об ошибке:

su@sudo:~$ do-release-upgrade -d 
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [1,554 B]                                         
Get:2 Upgrade tool [1,342 kB]                                                  
Fetched 1,343 kB in 0s (0 B/s)                                                 
authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
extracting 'focal.tar.gz'
Reading cache

Checking package manager

Can not upgrade 

Your python3 install is corrupted. Please fix the '/usr/bin/python3' 
symlink. 

ls -al / usr / bin | grep python3

lrwxrwxrwx  1 root root          29 Mar 27  2018 dh_python3 -> ../share/dh-python/dh_python3
lrwxrwxrwx  1 root root          23 Apr 18 07:26 pdb3.6 -> ../lib/python3.6/pdb.py
lrwxrwxrwx  1 root root          23 Nov  7  2019 pdb3.7 -> ../lib/python3.7/pdb.py
lrwxrwxrwx  1 root root          31 Oct 25  2018 py3versions -> ../share/python3/py3versions.py
lrwxrwxrwx  1 root root          19 Jun 10 15:12 python3 -> /usr/bin/python3.6m
lrwxrwxrwx  1 root root          16 Jun 10 14:36 python3.6 -> /usr/bin/python3
lrwxrwxrwx  1 root root          33 Apr 18 07:26 python3.6-config -> x86_64-linux-gnu-python3.6-config
-rwxr-xr-x  1 root root     4526456 Apr 18 07:26 python3.6m
lrwxrwxrwx  1 root root          34 Apr 18 07:26 python3.6m-config -> x86_64-linux-gnu-python3.6m-config
-rwxr-xr-x  2 root root     4873376 Nov  7  2019 python3.7
-rwxr-xr-x  2 root root     4873376 Nov  7  2019 python3.7m
lrwxrwxrwx  1 root root          16 Oct 25  2018 python3-config -> python3.6-config
lrwxrwxrwx  1 root root          10 Oct 25  2018 python3m -> python3.6m
lrwxrwxrwx  1 root root          17 Oct 25  2018 python3m-config -> python3.6m-config
lrwxrwxrwx  1 root root          34 Apr 18 07:26 x86_64-linux-gnu-python3.6-config -> x86_64-linux-gnu-python3.6m-config
-rwxr-xr-x  1 root root        3283 Apr 18 07:26 x86_64-linux-gnu-python3.6m-config
lrwxrwxrwx  1 root root          33 Oct 25  2018 x86_64-linux-gnu-python3-config -> x86_64-linux-gnu-python3.6-config
lrwxrwxrwx  1 root root          34 Oct 25  2018 x86_64-linux-gnu-python3m-config -> x86_64-linux-gnu-python3.6m-config

$ dpkg -l | egrep -v '^ ii | rc'

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
+++-=============================================-===================================================-============-=================================================================================
rFR python3                                       3.6.7-1~18.04                                       amd64        interactive high-level object-oriented language (default python3 version)