I had mounted a partition in /usr/share during installation of xubuntu.Then I used Gparted to format the partition. Then whenever I boot my PC a message is displayed "press s to skip d to manually mount the device". how can I solve this?
You need to edit
You should see a line like this:
UUID=XXXXXX /usr/share ext4 rw,errors=remount-ro 0 0
That is the line telling your system to mount the partition with UUID XXXX to the directory