*** This bug is a duplicate of bug 1813663 ***
https://bugs.launchpad.net/bugs/1813663
I can confirm I'm having the same problem with a Dell Precision 5510
laptop. I have traced the problem to the startup item
"/usr/lib/x86_64-linux-gnu/cinnamon-settings-daemon/csd-xrandr" it seems
xrandr is freezing the system when it boots up connected to a Thunderbolt 3
Dock.
If I disable that startup item, I can boot up while docked just fine, I
just can't change my monitoring configuration around. If I boot up using
the 4.15.0-43-generic kernel, that startup option works just fine and
everything works.
Somehow linux-image-4.15.0-44-generic has changed how the video card works
with Thunderbolt 3 docks and as soon as xrandr tries to fully initialize
the graphics cards everything freezes up.
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https://bugs.launchpad.net/bugs/1813742
Title:
package linux-image-4.15.0-44-generic 4.15.0-44.47 failed to
install/upgrade: installed linux-image-4.15.0-44-generic package pre-
removal script subprocess returned error exit status 1
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