[Bug 1902915] Re: (Snap) Cannot add an attachment to the message

[Alec B]

Here's the output of 
$ journalctl -f

-- Logs begin at Fri 2020-03-13 14:32:21 CET. --
Nov 05 17:14:30 main systemd[1]: Starting Hostname Service...
Nov 05 17:14:30 main dbus-daemon[1100]: [system] Successfully activated service 'org.freedesktop.hostname1'
Nov 05 17:14:30 main systemd[1]: Started Hostname Service.
Nov 05 17:15:00 main systemd[1]: systemd-hostnamed.service: Succeeded.
Nov 05 17:15:01 main CRON[12883]: pam_unix(cron:session): session opened for user root by (uid=0)
Nov 05 17:15:01 main CRON[12884]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Nov 05 17:15:01 main CRON[12883]: pam_unix(cron:session): session closed for user root
Nov 05 17:17:01 main CRON[12921]: pam_unix(cron:session): session opened for user root by (uid=0)
Nov 05 17:17:01 main CRON[12922]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Nov 05 17:17:01 main CRON[12921]: pam_unix(cron:session): session closed for user root

Nov 05 17:17:36 main audit[3814]: AVC apparmor="DENIED" operation="open" profile="snap.thunderbird.thunderbird" name="/etc/fstab" pid=3814 comm="thunderbird-bin" requested_mask="r" denied_mask="r" fsuid=1004 ouid=0
Nov 05 17:17:36 main kernel: audit: type=1400 audit(1604593056.015:61): apparmor="DENIED" operation="open" profile="snap.thunderbird.thunderbird" name="/etc/fstab" pid=3814 comm="thunderbird-bin" requested_mask="r" denied_mask="r" fsuid=1004 ouid=0
Nov 05 17:17:36 main kernel: audit: type=1400 audit(1604593056.015:62): apparmor="DENIED" operation="open" profile="snap.thunderbird.thunderbird" name="/run/mount/utab" pid=3814 comm="thunderbird-bin" requested_mask="r" denied_mask="r" fsuid=1004 ouid=0
Nov 05 17:17:36 main audit[3814]: AVC apparmor="DENIED" operation="open" profile="snap.thunderbird.thunderbird" name="/run/mount/utab" pid=3814 comm="thunderbird-bin" requested_mask="r" denied_mask="r" fsuid=1004 ouid=0
Nov 05 17:17:36 main dbus-daemon[1100]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.481' (uid=1004 pid=3814 comm="/snap/thunderbird/92/thunderbird-bin " label="snap.thunderbird.thunderbird (enforce)")
Nov 05 17:17:36 main audit[3814]: AVC apparmor="DENIED" operation="open" profile="snap.thunderbird.thunderbird" name="/run/mount/utab" pid=3814 comm="thunderbird-bin" requested_mask="r" denied_mask="r" fsuid=1004 ouid=0
Nov 05 17:17:36 main kernel: audit: type=1400 audit(1604593056.063:63): apparmor="DENIED" operation="open" profile="snap.thunderbird.thunderbird" name="/run/mount/utab" pid=3814 comm="thunderbird-bin" requested_mask="r" denied_mask="r" fsuid=1004 ouid=0
Nov 05 17:17:36 main systemd[1]: Starting Hostname Service...
Nov 05 17:17:36 main dbus-daemon[1100]: [system] Successfully activated service 'org.freedesktop.hostname1'
Nov 05 17:17:36 main systemd[1]: Started Hostname Service.
Nov 05 17:17:36 main audit[1100]: USER_AVC pid=1100 uid=106 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/org/freedesktop/hostname1" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.482" pid=3814 label="snap.thunderbird.thunderbird" peer_pid=13041 peer_label="unconfined"
                                   exe="/usr/bin/dbus-daemon" sauid=106 hostname=? addr=? terminal=?'
Nov 05 17:17:36 main kernel: audit: type=1107 audit(1604593056.107:64): pid=1100 uid=106 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/org/freedesktop/hostname1" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.482" pid=3814 label="snap.thunderbird.thunderbird" peer_pid=13041 peer_label="unconfined"
                              exe="/usr/bin/dbus-daemon" sauid=106 hostname=? addr=? terminal=?'
Nov 05 17:17:36 main kernel: audit: type=1107 audit(1604593056.107:65): pid=1100 uid=106 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/org/freedesktop/hostname1" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.482" pid=3814 label="snap.thunderbird.thunderbird" peer_pid=13041 peer_label="unconfined"
                              exe="/usr/bin/dbus-daemon" sauid=106 hostname=? addr=? terminal=?'
Nov 05 17:17:36 main audit[1100]: USER_AVC pid=1100 uid=106 auid=4294967295 ses=4294967295 msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/org/freedesktop/hostname1" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.482" pid=3814 label="snap.thunderbird.thunderbird" peer_pid=13041 peer_label="unconfined"

And finally ...

After installing xdg-desktop-portal-gtk the dialog appears. 
Maybe I'm missing something. It's a snap, can you explain why I need to install a debian package to get it working. Surely that's the whole point of snaps?

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https://bugs.launchpad.net/bugs/1902915

Title:
  (Snap) Cannot add an attachment to the message

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