I have the same issue on Unity:
$ echo $XDG_CURRENT_DESKTOP Unity:Unity7:ubuntu
$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 21.04 Release: 21.04 Codename: hirsute
Jul 4 11:02:35 jupiter org.gnome.Nautilus[7271]: sh: 1: /usr/lib/x86_64-linux-gnu/libproxy/0.4.17/pxgsettings: Permission denied Jul 4 11:02:35 jupiter kernel: [ 2602.257706] audit: type=1400 audit(1625353355.770:76): apparmor="DENIED" operation="exec" profile="/usr/bin/evince" name="/usr/lib/x86_64-linux-gnu/libproxy/0.4.17/pxgsettings" pid=7271 comm="sh" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
I have the same issue on Unity:
$ echo $XDG_CURRENT_ DESKTOP
Unity:Unity7:ubuntu
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 21.04
Release: 21.04
Codename: hirsute
Jul 4 11:02:35 jupiter org.gnome. Nautilus[ 7271]: sh: 1: /usr/lib/ x86_64- linux-gnu/ libproxy/ 0.4.17/ pxgsettings: Permission denied 5.770:76) : apparmor="DENIED" operation="exec" profile= "/usr/bin/ evince" name="/ usr/lib/ x86_64- linux-gnu/ libproxy/ 0.4.17/ pxgsettings" pid=7271 comm="sh" requested_mask="x" denied_mask="x" fsuid=1000 ouid=0
Jul 4 11:02:35 jupiter kernel: [ 2602.257706] audit: type=1400 audit(162535335