No disk space for Postgresql (JumpBox Tomcat - install Postgresql)


I have downloaded recent Tomcat Jumpbox. I changed my storage disk to 30GB instead of
original 10G according to the instruction.
I installed Postgresql using apt-get install. Then loading existing DB and tried to
copy this DB and backup DB, but postgresql says there is no space to copy.

I checked several point, but I should ask in this forum for this problem.

Could someone help for this problems.

Best Regards,
A. Yoshino