chechunli@PC:~ $ cat .Xmodmap
!
! Swap Caps_Lock and Control_L
!
remove lock = Caps_Lock
remove Control = Control_L
keysym Caps_Lock = Control_L
add Lock = Caps_Lock
add Control = Control_L
保存，再向你的 /etc/rc.local 文件加入一行：
xmodmap ~/.xmodmap 2>/dev/null