build.sh - grep for GNU bash version needs to be case-insensitive on line 269

[hmlio]

• Operating System Version: Ubuntu 18.04
• Provider (VirtualBox/VMWare): VirtualBox
• Vagrant Version:
• Packer Version:
• Building machines from scratch
• The issue is reproducable

The shell script "build.sh" checks for the version of bash with the following (line 269):
BASH_MAJOR_VERSION=$(/bin/bash --version | grep 'GNU bash' | grep -o version... | cut -d ' ' -f 2 | cut -d '.' -f 1)

On Ubuntu 18.04 '/bin/bash --version' prints
GNU bash, Version 4.4.20(1)-release (x86_64-pc-linux-gnu)
with a capital "V", causing the grep not to find a match.

Modifying line 269 to be:
BASH_MAJOR_VERSION=$(/bin/bash --version | grep 'GNU bash' | grep -oi version... | cut -d ' ' -f 2 | cut -d '.' -f 1)
does the trick.

[clong]

Thanks for the report and the proposed fix!