To make Caps Lock another Ctrl key, edit the file/etc/default/keyboardand change the line which reads
`XKBOPTIONS=""`
to
XKBOPTIONS="ctrl:swapcaps"
and then run:
$ sudo dpkg-reconfigure -phigh console-setup
double-check:
sudo dumpkeys | grep -C2 ' 85' # Capslock
sudo dumpkeys | grep -C2 ' 29' # Control