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android@android  :18:23:55  ~
--> sudo apt install --reinstall  unity8-desktop-session-mir
[sudo] password for android:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  darkplaces libode4
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 4,790 B of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://ubuntu.ntc.net.np/ubuntu xenial/universe amd64 unity8-desktop-session-mir all 1.0.12+15.10.20150609-0ubuntu1 [4,790 B]
Fetched 4,790 B in 0s (17.0 kB/s)
(Reading database ... 332564 files and directories currently installed.)
Preparing to unpack .../unity8-desktop-session-mir_1.0.12+15.10.20150609-0ubuntu1_all.deb ...
Unpacking unity8-desktop-session-mir (1.0.12+15.10.20150609-0ubuntu1) over (1.0.12+15.10.20150609-0ubuntu1) ...
Setting up unity8-desktop-session-mir (1.0.12+15.10.20150609-0ubuntu1) ...
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android@android  :19:20:43  ~
--> sudo dpkg-reconfigure sddm
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android@android  :19:21:04  ~
--> reboot