I have been using dual boot alongside Windows 8.1 from 1 year. Very recently the windows shut down unexpectedly, and then started showing "Trying to repair Windows". I knew it would harm Ubuntu file system, so i immediately powered off laptop. Next time when I booted it up, it shown that
"serious errors were found while checking the disk for /"
Then somehow, Ubuntu was able to fix it (I don't know how), and it booted up next time. But from then till today it works very very slowly ! All the programs and applications, even the Terminal opens after 2-5 minutes of clicking. I have gone through this and this link, but they didn't help! Is there some other way to get past this other than reinstalling ?