export RENPY_PLATFORM="linux-x86_64"
Place it inside DDLC.sh or Type it in terminal before execute it
I think, and this is just a guess, this means you have an ARM based computer (just type "uname -m" into the terminal to find out), which basically means you can't run this file directly because it's built for a different system.
The best way to run ddlc on arm chromebooks is box86 with wine. Heres how to do that. Type in terminal "git clone https://github.com/ptitSeb/box86 ". You can then download the latest tarred release of wine as of right now (7.1) here (to run the ddlc.exe file), and move that to your linux folders. Then type in the terminal "tar -xf wine-7.1-x86.tar.xz", and then type wine to confirm you have wine and that it is properly running, and then type "cd DDLC-1.1.1-pc" (assuming you already downloaded the DDLC zip file and unzipped it, and moved it to linux files), then type "wine ddlc.exe". It will take a bit, but will eventually start running. For some reason when I ran wine ddlc.exe again it would start up with no sound, so I guess you gotta play through the whole game without exiting on the first startup, but other than that I hope you are able to get it to run smoothly, and enjoy! This is a quite a bit of a process, but I can't really find any other ways to get DDLC to run. Any suggestions and help would be greatly appreciated. If you have any problems just let me know, and I'm happy to help.