[libretro ERROR] retro_load_game: couldn't read WAD header from '/home/pi/RetroPie/roms/ports/doom/doom2/DOOM2.WAD'
[INFO] [Environ]: SET_MESSAGE: ROM loading failed...
[ERROR] Failed to load content
Looks like it doesn't like your WAD. Try using another source. I've found one that works; I can't tell you where to get it but I can probably get away with sharing the crc32 and md5sum to help you determine if you've found the right one:
@kingcosmuder thats all i got running the command however i tired some dreamcast using redream and both games i tried, sonic adventure and marvel vs capcom 2 both ran 60 fps consistently so i believe its working now
@omission229 The question should not be will it work, in electronics the question should be how can I make this work? The only limiting factor is your drive to learn and how much work you want to put into a project.
The mappings for N64 are described in the emulators doc page - https://retropie.org.uk/docs/Nintendo-64/. If you wish to change it, you can either use RetroArch's input remapping for the lr-mupen64/lr-mupen64-next emulators or editing the InputAutoCfg.ini for the standalone mupen64plus emulator.
What exactly 'not working' means ? EmulationStation doesn't start ? Games aren't working ? Installation is not completing ?
Please add more details about your setup, including the Ubuntu version and hardware details.