Bug#803717: postinst: mountpoint: not found; the java command requires a mounted proc fs (/proc)

[Bart Overkamp]

Package: openjdk-7-jre-headless
Version: 7u85-2.6.1-6+deb8u1
Followup-For: Bug #803717

Dear Maintainer,

Running apt-get update & apt-get upgrade: the post-install script failed for me.
After removing the offending check in 
/var/lib/dpkg/info/openjdk-7-jre-headless:amd64.postinst the package installed 
without problems. (work around)