I have re-uploaded, removing the bootvga fix, and including the bug
report for the BrokenPipeError (LP: #1965520). Hopefully this is good to
go now.

** Description changed:

  [Steps to reproduce]
  1. Install 20.04.3 with "Third-party packages" on a system which containing a 
RTD3 supported nvidia card.
  2. After the installation, press enter to reboot system
  3. prime-select query
  
  [Expected result]
  on-demand
  
  [Actual result]
  performance
  
  ---
  
  It's because ubiquity launches `ubuntu-drivers install --packages-list
  ...` in live system but install each package to target storage.
  
  When installing nvidia-prime, the preinst set "on" to "/etc/prime-
  discrete" which will be referred by gpu-manager. The gpu-manager will
  set to performance mode.
  
  After confirming with Alberto on Mattermost, since we don't have a
  nvidia driver which lower than 450 version since focal.
  
  I think we are ok to switch to on-demand mode.
- 
  
  ---
  
  [Impact]
  
   * Ubuntu will set GPU mode to performance as default which may use more power
   * User can't use GPU for other purpose (eg: deep-learning) if RTD3 is not 
supported
   * According to Nvidia README, the RTD3 doesn't support on non-laptop machine
  
  [Test Plan]
  
   * Install Ubuntu, and then execute 'ubuntu-drivers install' to install GPU 
driver. After the installation, reboot the system. Execute "prime-select query" 
should get "on-demand"
   * Old GPU (which supported by nvidia-390 only) will keep in performance 
mode, refer LP:1957094. Execute "prime-select query" should get "nvidia"
   * On non-laptop machine. Can set GPU mode to on-demand
   * On laptop with GPU in runtime PM support list. Set GPU mode to on-demand 
and Nvidia driver is loaded with "NVreg_DynamicPowerManagement=0x02"
  
  [Where problems could occur]
  
   * With GPU supported RTD3 not able enable runtime PM on non-laptop. But
  based on the Nvidia README, this case shall not happened.
  
  [Other Info]
  
  Changelogs:
  
  nvidia-prime (0.8.16~0.20.04.2) focal; urgency=medium
  
-   [ Jeremy Szu ]
-   * Set on-demand mode as default nvidia mode (LP: #1942307)
+   [ Jeremy Szu ]
+   * Set on-demand mode as default nvidia mode (LP: #1942307)
  
-   [ Alberto Milone ]
-   * prime-select:
-     - Detect chassis type and enable RTD3 only
-       on laptops (LP: #1942788).
-     - on-demand mode doesn't need to depend on
-       RTD3 (LP: #1942789).
-     - Use bootvga detection when last_gfx_boot
-       is not available.
-     - Don't check the current profile when setting
-       a profile (LP: #1946476).
-     - Catch BrokenPipeError.
-     - Use bootvga detection when last_gfx_boot is
-       not available.
+   [ Alberto Milone ]
+   * prime-select:
+     - Detect chassis type and enable RTD3 only
+       on laptops (LP: #1942788).
+     - on-demand mode doesn't need to depend on
+       RTD3 (LP: #1942789).
+     - Don't check the current profile when setting
+       a profile (LP: #1946476).
+     - Handle BrokenPipeError (LP: #1965520).

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https://bugs.launchpad.net/bugs/1942307

Title:
  ubiquity uses performance mode for nvidia driver

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