After reinstalling Ubuntu 15.04, my swap partition was not active which is why Ubuntu did not hibernate. I followed steps given in this answer .
I edited /etc/fstab/ by typing sudo nano /etc/fstab in the terminal. Then removed the hash tag # from below # swap was on /dev/… and saved it and exited it.
Then I installed uswsusp from terminal by using sudo apt-get install uswsusp .
After I restarted, all hell broke loose. Ubuntu now takes forever to load. The five dots below ubuntu just keep running forever.
