Startup help needed (SOLVED)

My computer running Linux started this morning with a strange message and I have no idea what is happening now.
At the moment when I start up it comes up with the onscreen message

/dev/sda2 contains a file system with errors, check forced.
/dev/sda2: Inodes that were part of a corrupted orphan linked list found.

(i.e., without -a or -p options)
fsck exited with status code 4
The root filesystem on /dev/sda2 requires a manual fsck

BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
Enter ‘help’ for a list of built-in commands.

Any help please on what to do next ??
I have installed a new printer and am having problems with it and would like this startup problem sorted before I can get back to using my Linux computer.

take care
Don W

Problem solved via Thanks all.