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Yesterday I installed Linux I liked how it works on my computer, everything was fine until the need to turn off the computer because when I turned off and on all my pictures, my music were missing any changes to do after you reset or unplugged again to the same....

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At each restart my computer Disappear things I see? – Silvester Oct 25 '13 at 2:01
Are you using guest account or main account – Aatish Sai Oct 25 '13 at 2:02
guest ......... – Silvester Oct 25 '13 at 2:05
It happened to me also while using guest account. – Aatish Sai Oct 25 '13 at 2:07
How can I fix the problem? – Silvester Oct 25 '13 at 2:09

The problem might be because you are using guest account. Ubuntu's Guest account is a special type of account, which has its home directory set to the mount point of a tmpfs filesystem, which is used to store data which does not need to be persisted after a reboot.

The data in tmpfs is stored in RAM backed up by the swap space, so it is likely the data had never been written to disk in the first place, so there's basically nothing to recover.

More details on tmpfs.

If you're curious how guest account is set up, you can study /usr/sbin/guest-account, which is a shell script used to create/remove a guest account.

Answer from here

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Like Aatish said. the guest account, like windows and mac, will never save your pictures or music, or whatever you put on it. You can use the guest account to save the images to another Hard Drive, or a Flash drive, or a CD, or even saving it to an online storage service like Ubuntu-One or Dropbox. – Alex Oct 25 '13 at 2:37

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