[Bug 2088259] [NEW] Exception during pm.DoInstall when upgrading from Ubuntu18.04 to Ubuntu20.04

[Jen Kraine]

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 when processing triggers for libapache2-mod-php7.4 (7.4.3-4ubuntu2.24)
Errors encountered processing:
  sa-compile
Exception during pm.DoInstall(): E:Sub-process /usr/bin/dpkg returned an error code (1)

Could not install the upgrades

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

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https://bugs.launchpad.net/bugs/2088259

Title:
  Exception during pm.DoInstall when upgrading from Ubuntu18.04 to
  Ubuntu20.04

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 when processing triggers for libapache2-mod-php7.4 (7.4.3-4ubuntu2.24)
  Errors encountered processing:
    sa-compile
  Exception during pm.DoInstall(): E:Sub-process /usr/bin/dpkg returned an error code (1)

  Could not install the upgrades

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