*** This bug is a duplicate of bug 1866377 ***
    https://bugs.launchpad.net/bugs/1866377

I applied a workaround mentioned in bug #1866377, and this fixed the
problem:

user@laptop:/$ sudo apt purge --reinstall plymouth
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libplymouth5 shimmer-themes xubuntu-wallpapers
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  lightdm* plymouth* plymouth-label* plymouth-theme-ubuntu-text* 
plymouth-theme-xubuntu-logo* plymouth-theme-xubuntu-text* xubuntu-artwork* 
xubuntu-core* xubuntu-default-settings*
0 upgraded, 0 newly installed, 9 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 2.450 kB disk space will be freed.
Do you want to continue? [Y/n] y
(Reading database ... 242908 files and directories currently installed.)
Removing xubuntu-core (2.233) ...
Removing lightdm (1.30.0-0ubuntu3.1) ...
Removing xubuntu-default-settings (20.04) ...
Removing xubuntu-artwork (20.04) ...
update-alternatives: using /etc/newt/palette.ubuntu to provide 
/etc/newt/palette (newt-palette) in auto mode
Removing plymouth-theme-xubuntu-text (20.04) ...
update-alternatives: using 
/usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth to provide 
/usr/share/plymouth/themes/text.plymouth (text.plymouth) in auto mode
update-initramfs: deferring update (trigger activated)
Removing plymouth-theme-xubuntu-logo (20.04) ...
update-initramfs: deferring update (trigger activated)
Removing plymouth-label (0.9.4git20200109-0ubuntu6) ...
Removing plymouth-theme-ubuntu-text (0.9.4git20200109-0ubuntu6) ...
update-initramfs: deferring update (trigger activated)
Removing plymouth (0.9.4git20200109-0ubuntu6) ...
update-initramfs: deferring update (trigger activated)
Setting up initramfs-tools (0.136ubuntu1) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for libglib2.0-0:i386 (2.64.0-1) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libglib2.0-0:amd64 (2.64.0-1) ...
(Reading database ... 242603 files and directories currently installed.)
Purging configuration files for xubuntu-artwork (20.04) ...
Purging configuration files for plymouth (0.9.4git20200109-0ubuntu6) ...
Purging configuration files for plymouth-theme-ubuntu-text 
(0.9.4git20200109-0ubuntu6) ...
Purging configuration files for xubuntu-default-settings (20.04) ...
Purging configuration files for lightdm (1.30.0-0ubuntu3.1) ...
dpkg: warning: while removing lightdm, directory '/var/lib/lightdm-data' not 
empty so not removed
Processing triggers for systemd (244.3-1ubuntu1) ...
Processing triggers for dbus (1.12.16-2ubuntu2) ...
Processing triggers for initramfs-tools (0.136ubuntu1) ...
update-initramfs: Generating /boot/initrd.img-5.4.0-14-generic
I: The initramfs will attempt to resume from /dev/dm-2
I: (/dev/mapper/vgxubuntu-swap_1)
I: Set the RESUME variable to override this.
user@laptop:/$

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https://bugs.launchpad.net/bugs/1866425

Title:
  apt upgrade fails with an error

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