Hi.I can't change root password.I have root rights.I make command "passwd".Type new password ,retype .No error message.But when i lock the session and i want to input password,it does not work with new password.But only with old password ,work.Where is the problem?

I have installed on a usb stick from cd image.And i have looked in "etc/fstab" and my boot partition it is not there.And i guess that is with "ro" instead of "rw".But i can't find in "etc/fstab".This is my "etc/fstab" :

/etc/fstab: static file system information.
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/sda5
UUID=9945cb60-1e33-474b-9f95-83ccdb92e2ff / ext3 relatime,errors=remount-ro 0 1
# /dev/sda6
UUID=ed5bc842-4083-419d-a28c-be7579e2b1be none swap sw 0 0
/dev/hda /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0

And this are my partitions (usb)

Device Boot Start End Blocks Id System
/dev/sda1 * 1 5 40131 c W95 FAT32 (LBA)
/dev/sda2 6 1933 15486660 5 Extended
/dev/sda5 6 1846 14787801 83 Linux
/dev/sda6 1847 1933 698796 82 Linux swap / Solaris

"sda5" is one of my usb partition.So mister xorred , i am not stupid like you wanna say.Thing again if you wannna help someone.