Public bug reported:

update-manager -c
Checking for a new Ubuntu release
Checking for a new Ubuntu release
authenticate 'hirsute.tar.gz' against 'hirsute.tar.gz.gpg' 
extracting 'hirsute.tar.gz'
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-eyvhlkbh/hirsute", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeMain.py", 
line 236, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeController.py", 
line 2024, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeController.py", 
line 1860, in fullUpgrade
    if not self.doPostInitialUpdate():
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeController.py", 
line 894, in doPostInitialUpdate
    self.quirks.run("PostInitialUpdate")
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
99, in run
    func()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
121, in hirsutePostInitialUpdate
    self._test_and_fail_on_apple()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
375, in _test_and_fail_on_apple
    vendor = self._readDMIVendor()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
485, in _readDMIVendor
    vendor = f.read()
  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 0xff in position 0: invalid 
start byte
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-eyvhlkbh/hirsute", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeMain.py", 
line 236, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeController.py", 
line 2024, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeController.py", 
line 1860, in fullUpgrade
    if not self.doPostInitialUpdate():
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeController.py", 
line 894, in doPostInitialUpdate
    self.quirks.run("PostInitialUpdate")
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
99, in run
    func()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
121, in hirsutePostInitialUpdate
    self._test_and_fail_on_apple()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
375, in _test_and_fail_on_apple
    vendor = self._readDMIVendor()
  File 
"/tmp/ubuntu-release-upgrader-eyvhlkbh/DistUpgrade/DistUpgradeQuirks.py", line 
485, in _readDMIVendor
    vendor = f.read()
  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 0xff in position 0: invalid 
start byte

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1931148

Title:
  upgrade from 20.10 to 21.04 fails codec can't decode byte

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