When trying to for an install (in this case a format install) of JunOS sometimes the following will occur while logged in as root:
root@% install –format jinstall-YOURPACKAGE-signed.tgz
/sbin/install: Permission denied.
It will install correctly if install it from loader> prompt. You must have your USB drive connected before rebooting. Get there by hitting spacebar during boot:
Hit [Enter] to boot immediately, or space bar for command prompt.
– Press space bar
Then just install from here:
loader> install –format file:///jinstall-YOURPACKAGE-signed.tgz
BE AWARE THAT THERE ARE THREE SLASHES AFTER IN THAT COMMAND. It’s easy to overlook that if you aren’t copying and pasting.