Comment 37 for bug 908500

Here is the complete error when running customizer as non root (copied from a log file):

COMMAND=/usr/bin/gedit /var/log/secure

Jan 7 11:34:15 Asrockfc pkexec[1970]: rog: The value for the SHELL variable was not found the /etc/shells file [USER=root] [TTY=/dev/pts/1] [CWD=/home/rog/Documents] [COMMAND=/usr/local/bin/grub-customizer no-fork]

When I installed your program I was logged in as root rather than using sudo.
I have never used virtualbox. It would take me a while to learn how to use it.