error when copying file

[techz_boy]

/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/iso8859-7': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/iso8859-8': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/iso8859-9': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/iso8859-9e': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/ja': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/ja.JIS': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/ja.SJIS': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/ja_JP.UTF-8': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/ko': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/ko_KR.UTF-8': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/koi8-c': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/koi8-r': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/koi8-u': Read-only file system
cp: preserving times for `/mnt/hdc5/knx/source/KNOPPIX/usr/X11R6/lib/X11/locale/lib/common': Read-only file system

[babelbrennt]

not sure but if you unmount then remount read-write
umount /mnt/hdc5
mount -rw /dev/hdc5 /mnt/hdc5