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I am using a sandisk 8 GB, installed with ubuntu installing unetbootin, or whatever I do not remember.

When I plugged it into the pc, it read as follows:

Unable to access Ubuntu 13.04 i386
Error mounting /dev/sdc6 at /media/paul/Ubuntu 13.04 i386: Command-line `mount -t "iso9660" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,iocharset=utf8,mode=0400,dmode=0500" "/dev/sdc6" "/media/paul/Ubuntu 13.04 i386"' exited with non-zero exit status 32: mount: wrong fs type, bad option, bad superblock on /dev/sdc6,
   missing codepage or helper program, or other error
   In some cases useful info is found in syslog - try
   dmesg | tail  or so

what can I do about this problem?

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Try to make USB boot stick again, with formatting it. –  Danatela Mar 3 '14 at 4:13

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