Hi Tully,
in your minimal example libudev1 is already installed in the system
(util-linux : PreDepends: libudev1 and util-linux is essential). On the
other end, libnss-systemd, libpam-systemd, systemd-timesyncd and udev
are not essential (you can get the list with apt list '~E', note that
this does neither include systemd nor the kernel nor ubuntu-desktop
because the system could be a container). With this, the apt install
libudev1 action is the documented behavior (though maybe not intuitive):
This is also the target to use if you want to upgrade one or more
already-installed
packages without upgrading every package you have on your system.
Unlike the "upgrade"
target, which installs the newest version of all currently installed
packages,
"install" will install the newest version of only the package(s)
specified.
https://manpages.ubuntu.com/manpages/jammy/en/man8/apt-get.8.html
I.e. apt will try to fulfill the request to install the newest libudev1
without upgrading other packages and as this conflicts with other, non
essential, packages it will remove those.
You can avoid this with apt install --trivial-only libudev1 or apt
install --no-remove libudev1.
I was not able to reproduce the problem in ros2#1272 because of the
added Conflicts: in ros-humble-ros-workspace
(https://github.com/ros2-gbp/ros_workspace-release/pull/4).
Note that the Conflicts: libsystemd0 (<= 249.11-0ubuntu3), libudev1 (<=
249.11-0ubuntu3) are not really correct. The manual does not require
jammy-updates so installing on a system without it is broken now. You
probably want to add jammy-updates to the manual if the ROS build farm
includes them. Also they are rather temporary because any future updates
of src:systemd in jammy-updates could result in the same problem.
I would recommend to move the apt update && apt upgrade to the begin of
your manual and after adding additional apt sources.
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https://bugs.launchpad.net/bugs/1974196
Title:
Installing libudev1 on a new Jammy installation uninstalls many
packages.
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