This site is for the co-ordination of the Ubuntu project(s), and not support.
For Ubuntu Support options, there are many listed at https://community.ubuntu.com/t/finding-help/712
Please note: Ubuntu 18.10, which is in development/testing is off-topic for some of those sites (eg. on askubuntu ubuntu+1 is off-topic), but some still provide help (eg. #ubuntu+1 on irc.
If you believe it is a bug, please add a bug-report on launchpad (see https://help.ubuntu.com/community/ReportingBugs for more information). A report made here likely won’t be seen by developers or bug-squad as it’s not where they look.
If you did add a bug, please add the number here, as I just did a test & got the same result, I looked and didn’t see a report on the issue, so I may raise one… If you did raise a bug-report, I can then add “affects me too” to your bug which adds “heat” - but here is not the place for bug-reporting.
dmesg shows (note: I don’t have a printer setup, so could affect things; noted here as
ubuntu-bug isn’t currently co-operating - I’ll move when I can
[ 400.208807] audit: type=1400 audit(1536711261.421:51): apparmor=“DENIED” operation=“exec” profile="/usr/bin/evince" name="/usr/lib/x86_64-linux-gnu/glib-2.0/gio-launch-desktop" pid=5302 comm=“evince” requested_mask=“x” denied_mask=“x” fsuid=1000 ouid=0
[43361.474096] audit: type=1400 audit(1536710182.492:65): apparmor=“DENIED” operation=“exec” profile="/usr/bin/evince" name="/usr/lib/x86_64-linux-gnu/glib-2.0/gio-launch-desktop" pid=11840 comm=“evince” requested_mask=“x” denied_mask=“x” fsuid=1000 ouid=0
"Can’t preview document in evince - Ubuntu 18.10 Failed to execute child process (Permission Denied)"