Chromium does not start after update on 20.04

Question

Updated Ubuntu this morning. I saw a message about chromium switching to snap.
Now chromium does not starts:
jedi@Kramer:~$ chromium
[24999:25138:0722/180759.356229:ERROR:object_proxy.cc(622)] Failed to call method: org.freedesktop.DBus.ListActivatableNames: object_path= /org/freedesktop/DBus: org.freedesktop.DBus.Error.AccessDenied: An AppArmor policy prevents this sender from sending this message to this recipient; type="method_call", sender=":1.174" (uid=1000 pid=24999 comm="/snap/chromium/1229/usr/lib/chromium-browser/chrom" label="snap.chromium.chromium (enforce)") interface="org.freedesktop.DBus" member="ListActivatableNames" error name="(unset)" requested_reply="0" destination="org.freedesktop.DBus" (bus)
[25139:25139:0100/000000.413388:ERROR:sandbox_linux.cc(374)] InitializeSandbox() called with multiple threads in process gpu-process.
Trace/breakpoint trap (core dumped)
[25139:25160:0100/000000.485651:ERROR:gbm_wrapper.cc(272)] Failed to export buffer to dma_buf: No such file or directory (2)
[25139:25160:0100/000000.485709:ERROR:gbm_wrapper.cc(272)] Failed to export buffer to dma_buf: No such file or directory (2)
[25139:25160:0100/000000.485736:ERROR:gbm_wrapper.cc(272)] Failed to export buffer to dma_buf: No such file or directory (2)
[last line repeated multiple times]

Same message with chromium-browser.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04 LTS
Release:        20.04
Codename:       focal
$ snap info chromium
name:      chromium
summary:   Chromium web browser, open-source version of Chrome
publisher: Canonical#
store-url: https://snapcraft.io/chromium
contact:   https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bugs?field.tag=snap
license:   unset
description: |
  An open-source browser project that aims to build a safer, faster, and more stable way for all
  Internet users to experience the web.
commands:
  - chromium.chromedriver
  - chromium
snap-id:      XKEcBqPM06H1Z7zGOdG5fbICuf8NWK5R
tracking:     latest/stable
refresh-date: today at 18:07 CEST
channels:
  latest/stable:    84.0.4147.89 2020-07-15 (1229) 166MB -
  latest/candidate: 84.0.4147.89 2020-07-18 (1235) 166MB -
  latest/beta:      84.0.4147.85 2020-07-09 (1222) 164MB -
  latest/edge:      85.0.4183.26 2020-07-17 (1234) 166MB -
installed:          84.0.4147.89            (1229) 166MB -
WARNING: There is 1 new warning. See 'snap warnings'.
$ snap warnings
last-occurrence:  today at XX:XX XX
warning: |
  snap "chromium" has bad plugs or slots: system-packages-doc (unknown interface
  "system-packages-doc")
$ snap --version
snap    2.45.2
snapd   2.45.2
series  16
ubuntu  20.04
kernel  5.4.0-42-generic

Anybody knows how to fix this?

AnIdiot · Answer

Had the same problem, fixed it by moving to the snap edge release.
sudo snap refresh --edge chromium

Still has that same snap warning but at least chromium starts!

KGIII · Answer

For the time being, until fixed or if you'd prefer to do it this way, you can easily install Chromium via 'normal' means.
Press CTRL + ALT + T to open the terminal and enter the following:
sudo add-apt-repository ppa:saiarcot895/chromium-beta
sudo apt-get update
sudo apt-get install chromium-browser

That should get you sorted.

devGeek · Answer

Quoting from the Snapcraft forum,

The error is because the snap was updated to make use of an interface that has not yet been included in a stable release of snapd. This particular release of the Chromium snap on this particular version of snapd will always give that error.

There are possible two fixes for the same, as quoted on the forum

To fix it, one of two things need to happen: (1) snapd 2.46 is released, or (2) a new chromium snap without the system-packages-doc plug is released.

For a more detailed information, please refer bug reported here.
A fix for the same has been provided. Please refer link in this this comment, but is still not available in the stable channel yet.
Hope to get it soon!

Chromium does not start after update on 20.04

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