[Bug 1873545] Re: Permission denied error from show-motd when updates available

[Balint Reczey]

Maintainer scripts must not change files installed/owned by other
package.

The fix should be done in u-r-u.

--- update-motd-3.6.orig/debian/show-motd.postinst
+++ update-motd-3.6/debian/show-motd.postinst
@@ -0,0 +1,43 @@
+
+#!/bin/sh
...
+case "$1" in
+
+  configure)
+	# if it's WSL and we have 91-release-upgrade, disable it
+	if [ -e "/proc/sys/fs/binfmt_misc/WSLInterop" ] && [ -e "/etc/update-motd.d/91-release-upgrade" ]; then
+		[ -x "/etc/update-motd.d/91-release-upgrade" ] && chmod -x "/etc/update-motd.d/91-release-upgrade"
+	fi

** Changed in: update-motd
       Status: In Progress => Invalid

** Tags removed: patch

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https://bugs.launchpad.net/bugs/1873545

Title:
  Permission denied error from show-motd when updates available

Status in Ubuntu WSL:
  In Progress
Status in update-motd:
  Invalid
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in update-motd package in Ubuntu:
  Confirmed

Bug description:
  motd on demo of 20.04:

  Welcome to Ubuntu 20.04 LTS (GNU/Linux 4.19.84-microsoft-standard
  x86_64)

  ....

  26 updates can be installed immediately.
  0 of these updates are security updates.
  To see these additional updates run: apt list --upgradable

  /usr/lib/ubuntu-release-upgrader/release-upgrade-motd: 31: cannot
  create /var/lib/ubuntu-release-upgrader/release-upgrade-available:
  Permission denied

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