virtualbox.org

My system complains about 0 bit left when loging as Guest. The system is stucked when trying to login in my user account.
I increased the disk space of VirtualBox from 8 GB to 20 GB but I still get the error.

Command I used
I cannot login to Ubuntu's TTYs to debug this further. I do not understand the general procedure about how to debug a virtual OS inside VirtualBox.

How can you debug Ubuntu 14.04 inside El Capitan?

viewtopic.php?f=24&t=50661
Pay close attention to step 2

Also if you selected to use LVM when you installed you would need to use LVM to extend the primary partition. Seek assistance from Ubuntu on how to do that.