pgcollect failed

I followed the user guide and tried the jacobi iteration example.
However, when I tried pgcollect ./a.out,

it indiate :
pgcollect-Error-Required tool pgsampt was not found
pgcollect… looked for pgsampt at /opt/pgi/linux86-64/15.7/bin/pgsampt
pgcollect-Error-Required tool pgevtofq was not found
pgcollect… looked for pgevtofq at /opt/pgi/linux86-64/15.7/bin/pgevtofq

How to fix this ?

I am running a Ubuntu system with a trial license key.

Thanks.

Which Ubuntu version?

cat /etc/issue

thanks,
dave

Ubuntu 14.04.2 LTS

Thanks.