@mitu Thanks for your help ! all is good (i can lauch all emulators). I've just to remap controllers for dreamcast (to quit the emulator), for pcsx2 and N64. Thanks for all mitu !
If someone install pcsx2 with flatpak, the config file i used to launch it (/opt/retropie/configs/ps2/emulators.cfg) - you have to create the ps2 directory, and the emulators.cfg filepcsx2 = "flatpak run net.pcsx2.PCSX2 %ROM% --windowed" pcsx2-nogui = "flatpak run net.pcsx2.PCSX2 %ROM% --fulscreen" default = "pcsx2-nogui"
And now, i've to read all the forum to optimze retropie !!!!