当我sudo apt upgrade在 Ubuntu MATE 20.04 上运行时，我得到以下信息：
[various stuff]
Do you want to continue? [Y/n] y
Setting up bluez (5.53-0ubuntu3.7) ...
Failed to restart bluetooth.service: Unit bluetooth.service failed to load properly: File exists.
See system logs and 'systemctl status bluetooth.service' for details.
invoke-rc.d: initscript bluetooth, action "restart" failed.
● bluetooth.service - Bluetooth service
Loaded: error (Reason: Unit bluetooth.service failed to load properly: File exists.)
Active: inactive (dead)
Docs: man:bluetoothd(8)
Dec 20 14:30:21 ada systemd[1]: bluetooth.service: Two services allocated for the same bus name org.bluez, refusing operation.
[Above error appears 9 more times]
dpkg: error processing package bluez (--configure):
installed bluez package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
bluez
E: Sub-process /usr/bin/dpkg returned an error code (1)