[03-08-2021 16:49:16] [INFO] Data folder is:
[03-08-2021 16:49:16] [INFO] Data search is:
[03-08-2021 16:49:16] [INFO] - /home/john/.local/share/openxcom/data/
[03-08-2021 16:49:16] [INFO] - /tmp/.mount_zTbqk2/usr/share//openxcom/data/
[03-08-2021 16:49:16] [INFO] - /usr/share/pop/openxcom/data/
[03-08-2021 16:49:16] [INFO] - /home/john/.local/share/flatpak/exports/share/openxcom/data/
[03-08-2021 16:49:16] [INFO] - /var/lib/flatpak/exports/share/openxcom/data/
[03-08-2021 16:49:16] [INFO] - /usr/local/share/openxcom/data/
[03-08-2021 16:49:16] [INFO] - /usr/share/openxcom/data/
[03-08-2021 16:49:16] [INFO] - /usr/local/share/openxcom/data/
[03-08-2021 16:49:16] [INFO] - /usr/share/openxcom/data/
[03-08-2021 16:49:16] [INFO] - ./data/
[03-08-2021 16:49:16] [INFO] User folder is: /home/john/.local/share/openxcom/
[03-08-2021 16:49:16] [INFO] Config folder is: /home/john/.config/openxcom/
[03-08-2021 16:49:16] [INFO] Options loaded successfully.
[03-08-2021 16:49:16] [INFO] SDL initialized successfully.
[03-08-2021 16:49:16] [INFO] SDL_mixer initialized successfully.
[03-08-2021 16:49:16] [INFO] Attempting to set display to 640x400x8...
[03-08-2021 16:49:16] [INFO] Display set to 640x400x8.
[03-08-2021 16:49:16] [INFO] Loading ruleset...
[03-08-2021 16:49:16] [INFO] Ruleset loaded successfully.
[03-08-2021 16:49:16] [INFO] Loading resources...
[03-08-2021 16:49:16] [ERROR] GEODATA/PALETTES.DAT not found
[03-08-2021_17-34-38] [INFO] OpenXcom Version: 1.0.8d45159bf (2021-06-11 15:18)
[03-08-2021_17-34-38] [INFO] Platform: Unix-like
[03-08-2021_17-34-38] [INFO] Data folder is: /tmp/.mount_OpenXctmTwix/usr/share//openxcom/
[03-08-2021_17-34-38] [INFO] Data search is:
[03-08-2021_17-34-38] [INFO] - /home/john/.local/share/openxcom/data/
[03-08-2021_17-34-38] [INFO] - /home/john/.local/share/openxcom/
[03-08-2021_17-34-38] [INFO] - /tmp/.mount_OpenXctmTwix/usr/share//openxcom/
[03-08-2021_17-34-38] [INFO] - /usr/share/pop/openxcom/
[03-08-2021_17-34-38] [INFO] - /home/john/.local/share/flatpak/exports/share/openxcom/
[03-08-2021_17-34-38] [INFO] - /var/lib/flatpak/exports/share/openxcom/
[03-08-2021_17-34-38] [INFO] - /usr/local/share/openxcom/
[03-08-2021_17-34-38] [INFO] - /usr/share/openxcom/
[03-08-2021_17-34-38] [INFO] - /usr/local/share/openxcom/
[03-08-2021_17-34-38] [INFO] - /usr/share/openxcom/
[03-08-2021_17-34-38] [INFO] - /usr/share/openxcom//
[03-08-2021_17-34-38] [INFO] - ./
[03-08-2021_17-34-38] [INFO] User folder is: /home/john/.local/share/openxcom/
[03-08-2021_17-34-38] [INFO] Config folder is: /home/john/.config/openxcom/
[03-08-2021_17-34-38] [INFO] Options loaded successfully.
[03-08-2021_17-34-38] [INFO] SDL initialized successfully.
[03-08-2021_17-34-38] [INFO] SDL_mixer initialized successfully.
[03-08-2021_17-34-38] [INFO] requested file not found: openxcom.png
[03-08-2021_17-34-38] [INFO] Detected locale: ar_AE.utf8
[03-08-2021_17-34-38] [INFO] Attempting to set display to 640x400x8...
[03-08-2021_17-34-38] [INFO] Display set to 640x400x8.
[03-08-2021_17-34-38] [INFO] Loading data...
[03-08-2021_17-34-38] [INFO] Scanning standard mods in '/tmp/.mount_OpenXctmTwix/usr/share//openxcom/standard'...
[03-08-2021_17-34-38] [INFO] Scanning user mods in '/home/john/.local/share/openxcom/mods'...
[03-08-2021_17-34-38] [ERROR] no mod masters available
[03-08-2021_17-34-38] [ERROR] No X-COM installations found
As you are having trouble running OpenXcom, perhaps you may want to try running "OpenXcom Extended" instead, it can be found here:
https://openxcom.org/forum/index.php/topic,5258.0.html
The install is very simple, just unzip it and place the needed files from your copies of X-COM: UFO Defense and/or X-COM: Terror From the Deep into the /UFO/ and /TFTD/ folders found in the same folder with the OpenXcomEx executable.
It may be helpful if you mention which version of Linux you are running.