Ough, you really are a beginner.
The user "root" is indeed the super user, the user with the highest permissions. So (at least with a normal system) what root can't do no other user can do.
The file system 'root' (with the file name /) is the start of the file system. All files and directories accessible in the unix system are in this directory or a subdirectory of / .
There are several tools to test if a file system is available, the most usual is the system command mount. It lists all mounted file systems.
You should see something like
> mount<br/>
/dev/sda1 on / type ext3 (rw,acl,user_xattr)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
udev on /dev type tmpfs (rw)
devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
/dev/sda3 on /usr type ext2 (rw,acl,user_xattr)
usbfs on /proc/bus/usb type usbfs (rw)
Important for the actual problem is the line containing "/usr".
If a line containing that is shown, the "/usr" partition is mounted and available.
If no line containing /usr is shown, the file system is not mounted.
To help you we need some further information.
That are especially:
* The content of the file /etc/fstab
* The output of the command fdisk -l /dev/sda (or /dev/hda, or what ever the hard disk your partitions are on is named)
Additionally: you can show as which user you are working with the system command "whoami" (or the command "id")
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