lsb_release command existence checking in check_forked()

[yosshikazuki]

lsb_release does not have an option '-u' so this check will always result as false.
It could just check for the '-a' option.

docker-install/install.sh

Line 308 in 15dfae0

lsb_release -a -u > /dev/null 2>&1

The issue with this, is that the else statement checks the '-r' option so the script will likely to fail in all Debian based distros.

docker-install/install.sh

Line 328 in 15dfae0

if [ -r /etc/debian_version ] && [ "$lsb_dist" != "ubuntu" ] && [ "$lsb_dist" != "raspbian" ]; then