Comment 4 for bug 2040924

Related to this, look what I found while testing it...

https://bugs.launchpad.net/ubuntu/+source/landscape-client/+bug/1855544

postinst has been calling update-motd since at least 2009. I don't know if udpate-motd's behavior changed since then, but this is causing the landscape-sysinfo output to be displayed on package upgrade or reinstall. And only landscape-sysinfo, not any of the other scripts' output (from /etc/udpate-motd.d).

The update-motd(8) manpage states:
NAME
       update-motd - immediately update the dynamic MOTD and print it to stdout

This "stdout" component is not desired in the package maintainer script. We should either suppress it, or perhaps better, not use update-motd in the maintainer scripts and find some other way to update the sysinfo cache on install/upgrade.