[snap] chromium won't run over a remote X session

[Peter L Jones]

Since upgrading to Ubuntu 20.04.1 LTS from 18.04.5 LTS, starting Chromium Browser over a remote X session fails with
```
peter@fs-peter:~$ chromium-browser
KiTTY X11 proxy: Unsupported authorisation protocol
[28937:28937:1112/080948.455990:ERROR:browser_main_loop.cc(1426)] Unable to open X display.
peter@fs-peter:~$
```

The same happens for apps like `chrome-dominoes` (which, of course, is the critical issue ;) ).

Other applications run over remote X fine (Firefox, Jamulus, several other applications).

Apparently this is not the same as #1897224.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.11
Architecture: amd64
CasperMD5CheckResult: skip
DRM.card0-DP-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-HDMI-A-1:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-HDMI-A-2:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DRM.card0-HDMI-A-3:
 enabled: disabled
 dpms: Off
 status: disconnected
 edid-base64:
 modes:
DiskUsage:
 Filesystem Type Size Used Avail Use% Mounted on
 /dev/nvme0n1p1 ext4 229G 36G 181G 17% /
 tmpfs tmpfs 7.7G 16M 7.7G 1% /dev/shm
 /dev/nvme0n1p1 ext4 229G 36G 181G 17% /
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2019-11-07 (370 days ago)
InstallationMedia: Kubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
Lsusb:
 Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 04f3:0110 Elan Microelectronics Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 5000M
     |__ Port 8: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
     |__ Port 4: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
     |__ Port 4: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
Package: chromium-browser 1:85.0.4183.83-0ubuntu0.20.04.2
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-53-lowlatency root=UUID=bf22c190-dfc3-4cc0-aa69-df0f50d8c822 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-53.59-lowlatency 5.4.65
Snap.Changes:
 ID Status Spawn Ready Summary
 36 Done 2020-11-11T23:18:24Z 2020-11-11T23:18:35Z Auto-refresh snap "chromium"
Snap.ChromeDriverVersion: ChromeDriver 86.0.4240.193 (4b1dc838fc8d2b55f2147e7a642b20baf443da5c-refs/branch-heads/4240@{#1411})
Snap.ChromiumVersion: Chromium 86.0.4240.193 snap
Tags: focal snap
Uname: Linux 5.4.0-53-lowlatency x86_64
UpgradeStatus: Upgraded to focal on 2020-10-04 (39 days ago)
UserGroups: Jamulus adm audio cdrom dip lpadmin lxd minidlna plugdev sambashare sudo
_MarkForUpload: True
acpidump:
 Error: command ['pkexec', '/usr/share/apport/dump_acpi_tables.py'] failed with exit code 127: polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
 Error executing command as another user: Not authorized

 This incident has been reported.
dmi.bios.date: 12/18/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P3.30
dmi.board.name: Z370M-ITX/ac
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP3.30:bd12/18/2018:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ370M-ITX/ac:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

[Olivier Tilloy (osomon)]

Please run `apport-collect 1903957` to attach additional debug information to the bug. Thanks!

[Olivier Tilloy (osomon)]

Maybe related to bug #1857252.

[Peter L Jones (peter-drealm)]

Sorry, "chrome-dominoes" above, is
```
exec /usr/bin/chromium-browser --disable-gpu --profile-directory=Default --app-id=bomhoanbpkeifgklbpebekfgblgficjn
```
(The "--disable-gpu" was added following a suggestion that it might fix the issue but it had no effect.)

[Peter L Jones (peter-drealm)]

apport information

[Peter L Jones (peter-drealm)]

apport information

[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

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[Peter L Jones (peter-drealm)]

apport information

[Peter L Jones (peter-drealm)]

Also, for info:

peter@fs-peter:~$ sudo apport-collect 1903957
[sudo] password for peter:
KiTTY X11 proxy: Unsupported authorisation protocol
qt.qpa.xcb: could not connect to display localhost:11.0
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

Aborted (core dumped)
peter@fs-peter:~$

[Peter L Jones (peter-drealm)]

... which I tried because:

peter@fs-peter:~$ apport-collect 1903957
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
==== AUTHENTICATING FOR org.freedesktop.policykit.exec ===
Authentication is needed to run '/usr/share/apport/dump_acpi_tables.py' as the super user
Authenticating as: Peter Jones,,, (peter)
Password:
==== AUTHENTICATION FAILED ===
peter@fs-peter:~$

[Olivier Tilloy (osomon)]

This is also being discussed in https://forum.snapcraft.io/t/x11-connection-rejected-because-of-wrong-authentication/16528.

[LittleBigBrain (braingateway)]

same here, firefox, octave, etc cannot be open. The classic one is ok.

[LittleBigBrain (braingateway)]

X11 connection rejected because of wrong authentication.

[Peter L Jones (peter-drealm)]

For each snapped executable, I now write a wrapper. For example, chromium would use this:

#!/bin/sh -xeu
export CHROMIUM_DATA_DIR=$HOME
export CHROMIUM_RUNTIME_DIR=$HOME
exec /snap/chromium/current/usr/lib/chromium-browser/chrome --user-data-dir=$HOME/.config/chromium --class="ChrUnsnapped" $@

where the ..._DATA_DIR and ..._RUNTIME_DIR prefix are the exe name in upper case and you need to go hunting under /snap for the full path to the exe and under ~/.config for the --user-data-dir for the exec line. Note different programs expect different values for --user-data-dir -- firefox and thunderbird wanted $HOME, for example.