Hi,
I am using last focal fossa version of UT's on lavender (build number 2023-W13).
A) When I am trying remove a package, for that the installation has not
been completed before (it fails for several reason, e.g. the wifi was
disconnected during install) then
libertine-container-manager remove-package -p <PACKAGE_NAME>
is giving an error message that the package is already installed
(in german).
This message makes no sense at all, if I want to REMOVE the package! 
More problematic is, that I have no clue what exactly is the problem
and dont know how to resolve the problems.
Is it recommend to employ dpkg or apt in a shell of the corresponding container?
B.) All of my X11-Windows applications are just displaying black X11-screens
(just black windows filling the display). Any ideas what could be
the reason for that?
C) Installations of some packages (e.g. via
libertine-container-manager install-package -p gnuplot)
have failed, because of an error during
configuration of the dnsmasq-base package.
In detail I found the message, that the
directory /run/dnsmasq cannot be created
because I do not have rights for that.
(installed dnsmasq-script of the package
post-installation return error 1, so /usr/bin/dpkg did that as well)
I'd created first the folder by hand under
~/.cache/libertine-container/CONTAINER-IDENTIFIER/rootfs/
(home of user phablet), but it has not
change anything.
So I did switched to root (sudo -s), remounted
/ with write access and created /run/dnsmasq unter the root directory and installations have work after that.
D) It would also be good to mention in the documentation,
that in settings of the battery the "time until sleeping" should
be set to "Nether".
Bests.