Correct syntax error in issue-gen output

install.sh

@@ -290,7 +290,7 @@ echo "done."
 
 echo -n "Setting /etc/issue generator... "
 echo -e "#!/bin/sh
-IP="\$( ip addr show dev ${target_interface} | grep inet | awk \'{ print \$2 }\' )"
+IP="\$\( ip addr show dev ${target_interface} | grep inet | awk \'\{ print \$2 \}\' \)"
 echo -e \"Debian GNU/Linux 10 \\n \\l\n\nPrimary interface IP address: \$IP\n\" > /etc/issue" | tee ${target}/etc/if-up.d/issue-gen >&2
 chmod +x ${target}/etc/if-up.d/issue-gen 1>&2
 echo "done."