Hi Brian, I just tried it, but it seems to have the same issue: admin@jv:/home/jochen$ do-release-upgrade -p Checking for a new Ubuntu release Get:1 Upgrade tool signature [1,554 B] Get:2 Upgrade tool [1,349 kB] Fetched 1,350 kB in 0s (0 B/s) authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' extracting 'focal.tar.gz' [sudo] password for admin: To continue please press [ENTER] Get:1 http://archive.ubuntu.com/ubuntu focal InRelease [265 kB] Get:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB] Get:3 http://archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB] Get:4 http://archive.ubuntu.com/ubuntu focal-security InRelease [114 kB] Get:5 http://archive.ubuntu.com/ubuntu focal/main i386 Packages [718 kB] Get:6 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages [970 kB] Get:7 http://archive.ubuntu.com/ubuntu focal/main Translation-en [506 kB] Get:8 http://archive.ubuntu.com/ubuntu focal/main amd64 DEP-11 Metadata [494 kB] Get:9 http://archive.ubuntu.com/ubuntu focal/main DEP-11 48x48 Icons [98.4 kB] Get:10 http://archive.ubuntu.com/ubuntu focal/main DEP-11 64x64 Icons [163 kB] Get:11 http://archive.ubuntu.com/ubuntu focal/main amd64 c-n-f Metadata [29.5 kB] Get:12 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages [8,628 kB] Get:13 http://archive.ubuntu.com/ubuntu focal/universe i386 Packages [4,642 kB] Get:14 http://archive.ubuntu.com/ubuntu focal/universe Translation-en [5,124 kB] Get:15 http://archive.ubuntu.com/ubuntu focal/universe amd64 DEP-11 Metadata [3,603 kB] Get:16 http://archive.ubuntu.com/ubuntu focal/universe DEP-11 48x48 Icons [3,016 kB] Get:17 http://archive.ubuntu.com/ubuntu focal/universe DEP-11 64x64 Icons [7,794 kB] Get:18 http://archive.ubuntu.com/ubuntu focal/universe amd64 c-n-f Metadata [265 kB] Get:19 http://archive.ubuntu.com/ubuntu focal-updates/main i386 Packages [480 kB] Get:20 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages [988 kB] Get:21 http://archive.ubuntu.com/ubuntu focal-updates/main Translation-en [224 kB] Get:22 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 DEP-11 Metadata [264 kB] Get:23 http://archive.ubuntu.com/ubuntu focal-updates/main DEP-11 48x48 Icons [55.6 kB] Get:24 http://archive.ubuntu.com/ubuntu focal-updates/main DEP-11 64x64 Icons [87.9 kB] Get:25 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 c-n-f Metadata [13.4 kB] Get:26 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages [777 kB] Get:27 http://archive.ubuntu.com/ubuntu focal-updates/universe i386 Packages [574 kB] Get:28 http://archive.ubuntu.com/ubuntu focal-updates/universe Translation-en [167 kB] Get:29 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata [323 kB] Get:30 http://archive.ubuntu.com/ubuntu focal-updates/universe DEP-11 48x48 Icons [204 kB] Get:31 http://archive.ubuntu.com/ubuntu focal-updates/universe DEP-11 64x64 Icons [362 kB] Get:32 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 c-n-f Metadata [17.5 kB] Get:33 http://archive.ubuntu.com/ubuntu focal-backports/main amd64 c-n-f Metadata [112 B] Get:34 http://archive.ubuntu.com/ubuntu focal-backports/universe i386 Packages [2,932 B] Get:35 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 Packages [4,032 B] Get:36 http://archive.ubuntu.com/ubuntu focal-backports/universe Translation-en [1,448 B] Get:37 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 DEP-11 Metadata [1,764 B] Get:38 http://archive.ubuntu.com/ubuntu focal-backports/universe DEP-11 48x48 Icons [2,809 B] Get:39 http://archive.ubuntu.com/ubuntu focal-backports/universe DEP-11 64x64 Icons [3,944 B] Get:40 http://archive.ubuntu.com/ubuntu focal-backports/universe amd64 c-n-f Metadata [224 B] Get:41 http://archive.ubuntu.com/ubuntu focal-security/main amd64 Packages [664 kB] Get:42 http://archive.ubuntu.com/ubuntu focal-security/main i386 Packages [237 kB] Get:43 http://archive.ubuntu.com/ubuntu focal-security/main Translation-en [134 kB] Get:44 http://archive.ubuntu.com/ubuntu focal-security/main amd64 DEP-11 Metadata [24.4 kB] Get:45 http://archive.ubuntu.com/ubuntu focal-security/main DEP-11 48x48 Icons [11.0 kB] Get:46 http://archive.ubuntu.com/ubuntu focal-security/main DEP-11 64x64 Icons [16.5 kB] Get:47 http://archive.ubuntu.com/ubuntu focal-security/main amd64 c-n-f Metadata [7,668 B] Get:48 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 Packages [578 kB] Get:49 http://archive.ubuntu.com/ubuntu focal-security/universe i386 Packages [457 kB] Get:50 http://archive.ubuntu.com/ubuntu focal-security/universe Translation-en [90.1 kB] Get:51 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 DEP-11 Metadata [58.3 kB] Get:52 http://archive.ubuntu.com/ubuntu focal-security/universe DEP-11 48x48 Icons [26.7 kB] Get:53 http://archive.ubuntu.com/ubuntu focal-security/universe DEP-11 64x64 Icons [46.0 kB] Get:54 http://archive.ubuntu.com/ubuntu focal-security/universe amd64 c-n-f Metadata [11.3 kB] Fetched 43.6 MB in 6s (344 kB/s) Checking package manager Reading package lists... Done Building dependency tree Reading state information... Done Calculating the changes Calculating the changes Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade. This was likely caused by: * Unofficial software packages not provided by Ubuntu Please use the tool 'ppa-purge' from the ppa-purge package to remove software from a Launchpad PPA and try the upgrade again. If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to investigate this yourself the log files in '/var/log/dist-upgrade' will contain details about the upgrade. Specifically, look at 'main.log' and 'apt.log'. Restoring original system state Aborting Reading package lists... Done Building dependency tree Reading state information... Done === Command terminated with exit status 1 (Fri May 21 12:27:01 2021) === The contents of the log folder: admin@jv:/var/log/dist-upgrade/20210521-1221$ ll total 12 drwxr-xr-x 2 root root 4096 May 21 12:21 ./ drwxr-xr-x 27 root root 4096 May 21 12:24 ../ -rw-r--r-- 1 root root 824 May 21 12:21 main.log admin@jv:/var/log/dist-upgrade/20210521-1221$ more main.log 2021-05-21 12:21:08,299 INFO Using config files '['./DistUpgrade.cfg.bionic']' 2021-05-21 12:21:08,299 INFO uname information: 'Linux jv 5.4.0-72-generic #80~18.04.1-Ubuntu SMP Mon Apr 12 23:26:25 UTC 2021 x86_64' 2021-05-21 12:21:08,610 INFO apt version: '1.6.13' 2021-05-21 12:21:08,610 INFO python version: '3.6.9 (default, Jan 26 2021, 15:33:00) [GCC 8.4.0]' 2021-05-21 12:21:08,613 INFO release-upgrader version '20.04.33' started 2021-05-21 12:21:08,621 INFO locale: 'en_US' 'UTF-8' 2021-05-21 12:21:08,656 DEBUG screen returned: 'No Sockets found in /run/screen/S-root. ' 2021-05-21 12:21:08,657 INFO re-exec inside screen: '['screen', '-e', '\\0\\0', '-c', 'screenrc', '-S', 'ubuntu-release-upgrade-screen-window', '/tmp/ubuntu -release-upgrader-923g7i_e/focal', '--mode=server', '--frontend=DistUpgradeViewText']' admin@jv:/var/log/dist-upgrade/20210521-1221$ Hope that helps. Best regards, Jochen