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

[Jen Kraine]

Attached is the screen message:


** Attachment added: "apt.log"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2088259/+attachment/5837425/+files/apt.log

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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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