I had installed quake 4 on my system(quake4-linux-1.0.2147.12.x86.run)
And when I want to open it ...is displaying an error:

:/usr/local/games/quake4 # ./quake4
Quake4 Final V1.0.0.0 Build 2147.12 linux-x86 Oct 20 2005
found interface lo - loopback
found interface eth0 - 86.107.122.2/255.255.255.128
CPU: AMD CPU with MMX & 3DNow! & SSE
enabled Flush-To-Zero mode
--------- Initializing File System ----------
Loaded pk4 /usr/local/games/quake4/q4base/game000.pk4 with checksum 0x9321cee4
Loaded pk4 /usr/local/games/quake4/q4base/game100.pk4 with checksum 0x6f346a2
Current search path:
/root/.quake4/q4base
/usr/local/games/quake4/q4base
/usr/local/games/quake4/q4base/game100.pk4 (2 files)
/usr/local/games/quake4/q4base/game000.pk4 (2 files)
game DLL: 0x0 in pak: 0x0
Addon pk4s:
file system initialized.
---------------------------------------------
TODO: Sys_SetClipboardData
********************
ERROR: Couldn't load default.cfg - Check your working folder.
********************
Unknown command 'vid_restart'
--------------- BSE Shutdown ----------------
---------------------------------------------
WARNING: rvServerScanGUI::Clear() - invalid scanGUI

idRenderSystem::Shutdown()
Sys_Error: Couldn't load default.cfg - Check your working folder.

have you copied all the *.pk4 files from the retail cd to the /usr/local/games/quake4/q4base directory?
one of these .pk4 files contains default.cfg.

see here http://zerowing.idsoftware.com/linux/quake4/