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?