man breaks after upgrade to 18.04

[goathunter]

In a possibly silly move, last night, I upgraded Ubuntu MATE on my Pine A64+ from 16.04 to 18.04.

I'm still running the longsleep kernel 3.10.105. I was a little surprised that the upgrade worked, but it did. Everything was/is looking good, except that man is broken. When I run "man --debug man", I see:

Code:

man: can't execute preconv: Operation not permitted
loading seccomp filter (permissive: 1)
loading seccomp filter (permissive: 1)
loading seccomp filter (permissive: 0)
seccomp already enabled
man: can't execute col: Operation not permitted
man: can't execute tbl: Operation not permitted
trying encoding UTF-8 -> UTF-8//IGNORE
groff: couldn't exec troff: Operation not permitted

I can, of course, run all of those interactively without any problem.

Has anybody else tried upgrading to 18.04 and/or have any idea what the problem here might be?

Thanks!