Thanks, Titi!
Your first answer solved the issue (partially but more on this below).
Titi's second answer, mind those who are just trying to play Labyrinth, was directed at omega, NOT the general public!
So, I renamed "texture_Map #2.tga" to "texture_map #2.tga" and the message I posted earlier was gone.
However... another error appeared, complaining about not finding "archer_fire.bmp". I recalled someone said something about that needing renaming too (actually
copying) to "fire.bmp" (the alleged missing file) so I made a symbolic link (instead of a copy).
That error dealt with, another one came up. Another "texture_Map" one, this time "# 27". So I did the same as above for "texture_map #2".
If you want to play Labyrinth on you Linux machine, you'll have to run the following commands in a terminal-window (or console) after you've properly installed all the required folders (see file "READ ME. pdf" included in the Labyrinth folder for details on how to install Labyrinth):
Step 1: Define in which folder you have installed Labyrinth.
Option A: If you've installed it in your home folder this should be $HOME/.glest. So set that path so that the following commands apply to that sort of installation - in a terminal, run:
GLEST_PATH=$HOME/.glest
Option B: If you've installed it for system-wide usage, by any user on your system, instead run:
GLEST_PATH=/usr/share/games/glest
Note: On the following steps, if you went for option A, you can (and should) omit the "
sudo" command before all others. In case of option B, you MUST include the "
sudo" command!
Step 2: Correct the first error:
sudo mv -v "$GLEST_PATH/techs/labyrinth/factions/heroes/units/lvl_3_sniper/../lvl_1_ranger/models2/texture_Map #2.tga" "$GLEST_PATH/techs/labyrinth/factions/heroes/units/lvl_3_sniper/../lvl_1_ranger/models2/texture_map #2.tga
Step 3: Correct the second error:
cd $GLEST_PATH/techs/labyrinth/factions/heroes/units/lvl_5_sniper/../lvl_1_ranger/images/
sudo ln -sv fire.bmp archer_fire.bmp
Optional: Get back to your home folder:
cd
Step 4: Correct the third (and last) error:
sudo mv -v "$GLEST_PATH/techs/labyrinth/factions/heroes/units/palace/models/texture_Mapa #27.tga" "$GLEST_PATH/techs/labyrinth/factions/heroes/units/palace/models/texture_mapa #27.tga"
Step 5 (optional but tidy): No need to have the GLEST_PATH variable around anymore, so we'll unset it:
unset GLEST_PATH
EDIT:
The above instructions were for correctly loading Stage 1, but all the other four stages also load correctly afterwards.
And yes, the end of stage 1 has to be met with the ESCAPE key, after you've killed every foe.