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Could you please provide more information?
Please boot into the Ubuntu kernel and run the following command in a terminal
to collect debugging information and attach it to this report.
$ sudo apport-collect 2172135
** Changed in: linux-signed-oem-7.0 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2172135
Title:
linux-oem-7.0: shutdown/reboot hangs in nhi_pci_shutdown() after a
Thunderbolt dock with DisplayPort is plugged in (missing upstream fix
1fd1f67c94d3)
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