Urban Terror snap does not start

I do not know where to report this problem, so I do it here. I hope it’s the right place.
Ubuntu 18.10
Driver GPU: nvidia-driver-390

snap run urban-terror

realpath: ‘’: No such file or directory
realpath: ‘’: No such file or directory
realpath: ‘’: No such file or directory
realpath: ‘’: No such file or directory
realpath: ‘’: No such file or directory
realpath: ‘’: No such file or directory
realpath: ‘’: No such file or directory
realpath: ‘’: No such file or directory
ioQ3 1.35 urt 4.3.4 linux-x86_64 Jun 7 2018
----- FS_Startup -----
Current search path:
/home/emanu/snap/urban-terror/1/.q3a/q3ut4
/home/emanu/snap/urban-terror/1/.q3a/q3ut4/download
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_qvm.pk3 (4 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_021.pk3 (85 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_020.pk3 (295 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_019.pk3 (342 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_018.pk3 (801 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_017.pk3 (734 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_016.pk3 (487 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_015.pk3 (60 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_014.pk3 (510 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_013.pk3 (353 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_012.pk3 (271 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_011.pk3 (478 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_010.pk3 (1423 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_009.pk3 (476 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_008.pk3 (962 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_007.pk3 (368 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_006.pk3 (553 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_005.pk3 (898 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_004.pk3 (558 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_003.pk3 (53 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_002.pk3 (100 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/zUrT43_001.pk3 (759 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4/ut4_jumpents.pk3 (8 files)
/snap/urban-terror/1/UrbanTerror43/q3ut4
/snap/urban-terror/1/UrbanTerror43/q3ut4/download


10578 files in pk3 files
execing default.cfg
“MINUS” isn’t a valid key
“PLUS” isn’t a valid key
couldn’t exec q3config.cfg
couldn’t exec autoexec.cfg
Hunk_Clear: reset the hunk ok
----- Client Initialization -----
Couldn’t read q3history.
----- Initializing Renderer ----

QKEY found.
----- Client Initialization Complete -----
----- R_Init -----
…loading libGL.so.1:
Calling SDL_Init(SDL_INIT_VIDEO)…
SDL_Init(SDL_INIT_VIDEO) passed.
Initializing OpenGL display
…setting mode 8: 1280 1024
X Error: BadValue
Request Major code 151 (XFree86-VidModeExtension)
Request Minor code 10 ()
Value 0x1e3
Error Serial #171
Current Serial #173

snap info urban-terror
name: urban-terror
summary: Free multiplayer first person shooter developed by FrozenSand
publisher: Nubing D (nubing)
contact: https://github.com/nubing/urban-terror/issues
license: unset
description: |
Urban Terror can be described as a Hollywood tactical shooter; somewhat realism based, but the
motto is “fun over realism”. This results in a very unique, enjoyable and addictive game. It is
available for Windows, Linux and Macs.
commands:

  • urban-terror.dedicated
  • urban-terror
    snap-id: wyD87SBPoJn19vtXkUq30CHOHWi0LFF3
    tracking: stable
    refresh-date: 3 days ago, at 22:06 CET
    channels:
    stable: 4.3.4 (1) 1GB -
    candidate: ↑
    beta: ↑
    edge: 4.3.4 (1) 1GB -
    installed: 4.3.4 (1) 1GB -

Sorry, I only saw the contact link on where to report now. None of this info on Ubuntu software center.