Flash Drive unable to mount

please provide the command that you used.
And the format table & the file system of each partision if possible (fdisk and parted are utilities that can be used to obtain those info).

I didn't do anything. I put in my flash drive and then clicked on the icon and the message: invalid mount option... popped up. that is why I am confused.....
I wish I could elaborate more, but that is all that happened.

please issue gksu gedit /etc/fstab
command will prompt for your password

now in the text editor ---- see that a line similar to this is not present

/dev/sdX1 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
where x can be b, c, d etc
if present delete that line
save the file; exit editor
then try to insert the usb drive in and see that it works or not

caution!
there would be a line similar as
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0 /dev/scd0 corresponds to your cd drive so do not change or delete this line

i typed in gksu gedit /etc/fstab and this message appeared:

(gksu: 7600): Gtk-WARNING **: cannot open display:

then it goes back to my login....

am i doing something wrong?

sorry for late response

could you issue this command in terminal and paste its output here

cat /etc/fstab

# /etc/fstab Static file system information
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/sdal
UUID=a9906d20-d2b0-448c-b770-818d6e11eff0/ ext3 realtime error
s=remount-ro 0 1
# /dev/sda5
UUID= eae9eafl-550f-40be-8ed5-cee277270a50 none swap sw
   0 0
/dev/sdb1 /media/cdrom0 ufd, iso9660, user, noauto, exec, uff8 0 0
/dev/scd0 /media/cdrom1 ufd, iso9660, user, noauto, exec, uff8 0 0
/dev/scd1 /media/cdrom2 ufd, iso9660, user, noauto, exec, uff8 0 0
/dev/scd2 /media/cdrom3 ufd, iso9660, user, noauto,exec, uff8 0 0

This is what pops up when i type i cat /etc/fstab.
I couldn't copy it so I wrote in it... like it was on the screen. I hope it makes sense!

Thanks again!
Marjie

oh don't be so worried
issue following command in terminal

sudo gedit /etc/fstab ------------as gksu didn't work

this will grant you super user privileges for gedit
now delete this line and save the file

/dev/sdb1 /media/cdrom0 ufd, iso9660, user, noauto, exec, uff8 0 0

try reinserting your pen drive it should work now

but you have done copy and pasting through terminal also ; for next time:
https://help.ubuntu.com/community/UsingTheTerminal

hope it helps