sudo do-release-upgrade 
Checking for a new Ubuntu release
Get:1 Upgrade tool signature [819 B]                                           
Get:2 Upgrade tool [1 268 kB]                                                  
Fetched 1 269 kB in 0s (0 B/s)                                                 
authenticate 'hirsute.tar.gz' against 'hirsute.tar.gz.gpg' 
extracting 'hirsute.tar.gz'

Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Hit http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/1.18/xUbuntu_20.10  InRelease
Hit http://ppa.launchpad.net/cappelikan/ppa/ubuntu focal InRelease             
Hit https://deb.nodesource.com/node_14.x groovy InRelease                      
Hit https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_20.10  InRelease
Hit https://packages.microsoft.com/repos/ms-teams stable InRelease             
Hit http://cz.archive.ubuntu.com/ubuntu focal InRelease                        
Hit https://packages.riot.im/debian default InRelease                          
Hit http://security.ubuntu.com/ubuntu focal-security InRelease                 
Hit https://github.com/retorquere/zotero-deb/releases/download/apt-get ./ InRelease
Hit http://cz.archive.ubuntu.com/ubuntu focal-updates InRelease                
Get:1 https://packages.cloud.google.com/apt kubernetes-xenial InRelease [9 383 B]
Hit http://cz.archive.ubuntu.com/ubuntu focal-backports InRelease              
Hit http://cz.archive.ubuntu.com/ubuntu groovy InRelease                       
Hit https://packagecloud.io/slacktechnologies/slack/debian jessie InRelease    
Fetched 9 383 B in 0s (0 B/s)                                                  
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 197, in _get_from_and_to_version
    di.version('%s' % self.controller.fromDist).split()[0]
AttributeError: 'UbuntuDistroInfo' object has no attribute 'version'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/hirsute", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeMain.py", line 236, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeController.py", line 2024, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeController.py", line 1860, in fullUpgrade
    if not self.doPostInitialUpdate():
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeController.py", line 894, in doPostInitialUpdate
    self.quirks.run("PostInitialUpdate")
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 99, in run
    func()
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 118, in hirsutePostInitialUpdate
    self._get_from_and_to_version()
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 203, in _get_from_and_to_version
    (r.version for r in di.get_all("object")
AttributeError: 'UbuntuDistroInfo' object has no attribute 'get_all'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/problem_report.py", line 477, in add_to_existing
    self.write(f)
  File "/usr/lib/python3/dist-packages/problem_report.py", line 430, in write
    block = f.read(1048576)
  File "/usr/lib/python3.8/codecs.py", line 322, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

Original exception was:
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 197, in _get_from_and_to_version
    di.version('%s' % self.controller.fromDist).split()[0]
AttributeError: 'UbuntuDistroInfo' object has no attribute 'version'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/hirsute", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeMain.py", line 236, in main
    if app.run():
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeController.py", line 2024, in run
    return self.fullUpgrade()
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeController.py", line 1860, in fullUpgrade
    if not self.doPostInitialUpdate():
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeController.py", line 894, in doPostInitialUpdate
    self.quirks.run("PostInitialUpdate")
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 99, in run
    func()
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 118, in hirsutePostInitialUpdate
    self._get_from_and_to_version()
  File "/tmp/ubuntu-release-upgrader-mzoy5_xm/DistUpgrade/DistUpgradeQuirks.py", line 203, in _get_from_and_to_version
    (r.version for r in di.get_all("object")
AttributeError: 'UbuntuDistroInfo' object has no attribute 'get_all'

$ lsb_release  -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.10
Release:	20.10
Codename:	groovy