crash during new install of 20.04.2 LTS on top of 12.04 LTS, apt clone error

[Mark Wittenberg]

Not an upgrade; a new install on top of a previous 12.04 LTS.
Crash when trying to install previously installed apps.

$ lsb_release -rd
Description: Ubuntu 20.04.2 LTS
Release: 20.04

Expected: successful install
Happened: installer crashed

Last page of /var/log/syslog:
Jun 26 04:03:22 ubuntu rtkit-daemon[2320]: Supervising 4 threads of 2 processes of 1 users.
Jun 26 04:03:23 ubuntu rtkit-daemon[2320]: message repeated 8 times: [ Supervising 4 threads of 2 processes of 1 users.]
Jun 26 04:07:17 ubuntu systemd-resolved[1656]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Jun 26 04:08:22 ubuntu rtkit-daemon[2320]: Supervising 4 threads of 2 processes of 1 users.
Jun 26 04:08:22 ubuntu rtkit-daemon[2320]: Supervising 4 threads of 2 processes of 1 users.
Jun 26 04:10:33 ubuntu NetworkManager[1806]: <info> [1624680633.6256] dhcp6 (enp12s0): option dhcp6_domain_search => 'attlocal.net'
Jun 26 04:10:33 ubuntu NetworkManager[1806]: <info> [1624680633.6257] dhcp6 (enp12s0): option dhcp6_name_servers => '2600:1700:bb10:a530::1'
Jun 26 04:10:33 ubuntu NetworkManager[1806]: <info> [1624680633.6257] dhcp6 (enp12s0): option ip6_address => '2600:1700:bb10:a530::49'
Jun 26 04:10:33 ubuntu NetworkManager[1806]: <info> [1624680633.6257] dhcp6 (enp12s0): state changed bound -> bound
Jun 26 04:10:33 ubuntu dbus-daemon[1803]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.16' (uid=0 pid=1806 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
Jun 26 04:10:33 ubuntu systemd[1]: Starting Network Manager Script Dispatcher Service...
Jun 26 04:10:33 ubuntu dbus-daemon[1803]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jun 26 04:10:33 ubuntu systemd[1]: Started Network Manager Script Dispatcher Service.
Jun 26 04:10:44 ubuntu systemd[1]: NetworkManager-dispatcher.service: Succeeded.
Jun 26 04:12:17 ubuntu systemd-resolved[1656]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Jun 26 04:14:52 ubuntu rtkit-daemon[2320]: Supervising 4 threads of 2 processes of 1 users.
Jun 26 04:16:21 ubuntu rtkit-daemon[2320]: message repeated 3 times: [ Supervising 4 threads of 2 processes of 1 users.]
Jun 26 04:17:01 ubuntu CRON[150651]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Jun 26 04:17:17 ubuntu systemd-resolved[1656]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Jun 26 04:22:19 ubuntu systemd-resolved[1656]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Jun 26 04:22:43 ubuntu gvfs-goa-volume[2416]: monitor says it's not supported
Jun 26 04:22:43 ubuntu dbus-daemon[1803]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.173' (uid=999 pid=149914 comm="/usr/lib/firefox/firefox https://bugs.launchpad.ne" label="unconfined")
Jun 26 04:22:43 ubuntu systemd[1]: Starting Hostname Service...
Jun 26 04:22:43 ubuntu dbus-daemon[1803]: [system] Successfully activated service 'org.freedesktop.hostname1'
Jun 26 04:22:43 ubuntu systemd[1]: Started Hostname Service.
Jun 26 04:23:34 ubuntu systemd[1]: systemd-hostnamed.service: Succeeded.
Jun 26 04:24:26 ubuntu dbus-daemon[1803]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.177' (uid=999 pid=149914 comm="/usr/lib/firefox/firefox https://bugs.launchpad.ne" label="unconfined")
Jun 26 04:24:26 ubuntu systemd[1]: Starting Hostname Service...
Jun 26 04:24:26 ubuntu dbus-daemon[1803]: [system] Successfully activated service 'org.freedesktop.hostname1'
Jun 26 04:24:26 ubuntu systemd[1]: Started Hostname Service.
Jun 26 04:25:31 ubuntu systemd[1]: systemd-hostnamed.service: Succeeded.
Jun 26 04:27:10 ubuntu dbus-daemon[2169]: [session uid=999 pid=2169] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.11' (uid=999 pid=2155 comm="/usr/libexec/tracker-miner-fs " label="unconfined")
Jun 26 04:27:10 ubuntu systemd[2135]: Starting Tracker metadata database store and lookup manager...
Jun 26 04:27:10 ubuntu dbus-daemon[2169]: [session uid=999 pid=2169] Successfully activated service 'org.freedesktop.Tracker1'
Jun 26 04:27:10 ubuntu systemd[2135]: Started Tracker metadata database store and lookup manager.
~

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15.10
ProcVersionSignature: Ubuntu 5.8.0-43.49~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-43-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
Date: Fri Jun 25 21:02:37 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)