[Bug 2087838] [NEW] errors while processing sa-compile during upgrade from Ubuntu 18.04.6 to Ubuntu 20.04

[Ngate Cloud]

Public bug reported:

1. I'm trying to upgrade Ubuntu from 18.04.6 to Ubuntu 20.04.6. on an Alibaba cloud instance:
do-release upgrade

2. The version of the package is unknown:
apt-cache policy pkgname returns:
N: Unable to locate package pkgname

3. I expected the upgrade to complete without errors.

4. But errors occured when processing sa-compile.
The upgrade still completed but with errors.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2087838

Title:
  errors while processing sa-compile during upgrade from Ubuntu 18.04.6
  to Ubuntu 20.04

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  1. I'm trying to upgrade Ubuntu from 18.04.6 to Ubuntu 20.04.6. on an Alibaba cloud instance:
  do-release upgrade

  2. The version of the package is unknown:
  apt-cache policy pkgname returns:
  N: Unable to locate package pkgname

  3. I expected the upgrade to complete without errors.

  4. But errors occured when processing sa-compile.
  The upgrade still completed but with errors.

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