Can't update to 20.10

Question

Results of sudo do-release-upgrade :

Checking for a new Ubuntu release 
Get: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 
Reading package lists... Done 
Building dependency tree
Reading state information... Done 
Hit http://dk.archive.ubuntu.com/ubuntu focal InRelease
Hit http://dk.archive.ubuntu.com/ubuntu focal-updates InRelease     
Hit http://security.ubuntu.com/ubuntu focal-security InRelease       
Hit http://archive.ubuntu.com/ubuntu focal InRelease                 
Hit http://ppa.launchpad.net/system76/pop/ubuntu focal InRelease     
Hit http://dk.archive.ubuntu.com/ubuntu focal-backports InRelease   
Fetched 0 B in 0s (0 B/s)                                           
Reading package lists... Done     
Building dependency tree          
Reading state information... Done
Checking for installed snaps
Calculating snap size requirements
Updating repository information
Traceback (most recent call last):   File
 "/tmp/ubuntu-release-upgrader-1p89v3_w/groovy", line 8, in <module>
     sys.exit(main())   File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeMain.py",
line 238, in main

if app.run(): File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeController.py", line 2089, in run return self.fullUpgrade() File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeController.py", line 1932, in fullUpgrade if not self.updateSourcesList(): File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeController.py", line 801, in updateSourcesList self.sources = SourcesList(matcherPath=self.datadir) File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 273, in init self.matcher = SourceEntryMatcher(matcherPath) File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 470, in init dist = DistInfo(base_dir=matcherPath) File "/usr/lib/python3/dist-packages/aptsources/distinfo.py", line 184, in init with open(dist_fname) as dist_file: FileNotFoundError: [Errno 2] No such file or directory: '/tmp/ubuntu-release-upgrader-1p89v3_w/Pop.info' 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-1p89v3_w/groovy", line 8, in sys.exit(main()) File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeMain.py", line 238, in main if app.run(): File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeController.py", line 2089, in run return self.fullUpgrade() File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeController.py", line 1932, in fullUpgrade if not self.updateSourcesList(): File "/tmp/ubuntu-release-upgrader-1p89v3_w/DistUpgrade/DistUpgradeController.py", line 801, in updateSourcesList self.sources = SourcesList(matcherPath=self.datadir) File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 273, in init self.matcher = SourceEntryMatcher(matcherPath) File "/usr/lib/python3/dist-packages/aptsources/sourceslist.py", line 470, in init dist = DistInfo(base_dir=matcherPath) File "/usr/lib/python3/dist-packages/aptsources/distinfo.py", line 184, in init

    with open(dist_fname) as dist_file: FileNotFoundError: [Errno 2] No such file or directory:
> '/tmp/ubuntu-release-upgrader-1p89v3_w/Pop.info'

EDIT:

sudo apt install ppa-purge
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Suggested packages:
  aptitude
The following NEW packages will be installed:
  ppa-purge
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 6.312 B of archives.
After this operation, 24,6 kB of additional disk space will be used.
Get:1 http://dk.archive.ubuntu.com/ubuntu focal/universe amd64 ppa-purge all 0.2.8+bzr63 [6.312 B]
Fetched 6.312 B in 0s (14,3 kB/s)     
Selecting previously unselected package ppa-purge.
(Reading database ... 327513 files and directories currently installed.)
Preparing to unpack .../ppa-purge_0.2.8+bzr63_all.deb ...
Unpacking ppa-purge (0.2.8+bzr63) ...
Setting up ppa-purge (0.2.8+bzr63) ...
Processing triggers for man-db (2.9.1-1) ...
x@x:~$ sudo ppa-purge ppa:system76/pop
Updating packages lists
PPA to be removed: system76 pop
Warning:  Could not find package list for PPA: system76 pop

Answer 1

I was running into the same 'missing Pop.info' error while attempting to upgrade to Pop! OS 20.10. I was able to work around it with the following procedure:

# Begin upgrade
sudo do-release-upgrade
# Pause the process with Ctrl-Z
^Z
# Create an empty Pop.info file in the newest /tmp/ubuntu-release-upgrader-* directory
sudo touch /tmp/ubuntu-release-upgrade-*/Pop.info
# Resume the upgrade process
fg

Answer 2

In addition to @cwc 's answer,

# Begin upgrade
sudo do-release-upgrade

# Pause the process with Ctrl-Z
^Z

# Find the tmp folder that newly created. And store LAST_CREATED_FOLDER variable.
LAST_CREATED_FOLDER=$(sudo ls -t /tmp/ | grep ubuntu-release-upgrader | head -1)

# Create an empty Pop.info file in the newest /tmp/ubuntu-release-upgrader-* directory
sudo touch /tmp/$LAST_CREATED_FOLDER/Pop.info

# Resume the upgrade process
fg