You are right that there are two places this is defined: in
/etc/apparmor.d/abstractions/ubuntu-browsers.d/ubuntu-integration and in
/etc/apparmor.d/usr.bin.evince.
I'll adjust apparmor to fix ubuntu-integration to use the exo-open
abstraction.
There is an evince task though because we don't want it to use the
ubuntu-integration abstraction. Instead the exo-open stanza in the
usr.bin.evince should just include the exo-open abstraction. Ie, replace
this:
# For Xubuntu to launch the browser
/usr/bin/exo-open ixr,
/usr/lib/@{multiarch}/xfce4/exo-1/exo-helper-1 ixr,
/etc/xdg/xdg-xubuntu/xfce4/helpers.rc r,
/etc/xdg/xfce4/helpers.rc r,
with this:
# For Xubuntu to launch the browser
#include <abstractions/exo-open>
** Also affects: evince (Ubuntu)
Importance: Undecided
Status: New
** Changed in: apparmor (Ubuntu)
Status: New => In Progress
** Changed in: evince (Ubuntu)
Status: New => Triaged
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https://bugs.launchpad.net/bugs/1891338
Title:
apparmor misconfigured for envice
Status in apparmor package in Ubuntu:
In Progress
Status in evince package in Ubuntu:
Triaged
Bug description:
On a fully up to date xubuntu 20-04 system, when i run evince and
click on a link, it fails to follow that link in my browser. This kind
of thing happens when you are reading a technical paper and want to
follow one of the references and click on the doi or url.
When i click on the link i get a box that i cannot copy from that says:
Failed to launch preferred application for category "WebBrowser".
Failed to execute child process "/usr/lib/x86_64-linux-gnu/xfce4/exo-2
/exo-helper-2"(Permission denied).
Did I say that it is annoying that i could not copy the text in this
box!!!!!!
The output of the ldd command you asked for is attached.
I should also point out that this worked fine under xubuntu 18.04.
I had originally posted this as an additional comment on
https://bugs.launchpad.net/ubuntu/+source/evince/+bug/1869159?comments=all
but https://launchpad.net/~seb128 said that I should submit this as a
separate bug because this is likely an apparmor configuration problem
that is similar to the ancient bug
https://bugs.launchpad.net/bugs/987578.
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