how to fix ubuntu computer not visible to samba

repair :
sudo /etc/init.d/winbind restart

check :
findsmb
smbtree

how to set a fat (vfat) disk on key label in ubuntu linux

reference : https://help.ubuntu.com/community/RenameUSBDrive

FAT16 and FAT32

These filesystems are most often found on USB thumb drives, flash cards (like for a camera or cell phone), and older external USB hard drives.
Check the current label

sudo mlabel -i  -s ::

ex:

     sudo mlabel -i /dev/sdb1 -s ::

Note that we're using the special "::" drive which allows us to specify the device descriptor on the command line; otherwise we'd have to edit ~/.mtoolsrc to assign a drive letter (see Option 2 under "Change the label").

Change the label

Option 1

After unmounting and checking the current label (above), use

sudo mlabel -i  ::

ex:

     sudo mlabel -i /dev/sdb1 ::my_external

Ignore the "Volume label is XYZ" output as this is the old label. Jump to the Verify the Change section below. 

how to fix profile in use lock in firefox

http://kb.mozillazine.org/Profile_in_use