I am reading through the LPI book and they talk about placing the /usr directory on a seperate partition. This I can understand. They also recommend mounting it as a read-only filesystem. While this makes sense I have noticed that on the Ubuntu servers that I use there are a few programs that all install to the /usr directory. Is Ubuntu one of the distros that strays from the norm? I have seen in the RHCE books they talk about applications installing to /opt but that directory is empty on my servers.