Seems that problem in apparmor profile loading on older kernels. I have the same issue on custom kernel 4.4, but with ubuntu kernel 4.15 everything ok.
Workaround for older kernels: apt install apparmor-utils aa-disable /usr/bin/man Upstream Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=889617 ** Bug watch added: Debian Bug tracker #889617 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=889617 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1778684 Title: man: command exited with status 4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/man-db/+bug/1778684/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
