I tried to boot with Ubuntu LiveUSB and copy my important data to some external media.But permission denied shows,so how to change the permission?
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What command did you use ? – hg8 Oct 22 '15 at 08:19
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I don't know? I booted from another OS – Allen miles Oct 22 '15 at 08:23
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try this if useful =) – Ravan Oct 22 '15 at 08:31
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2Possible duplicate of 12.04 run from cd, cannot copy files from mounted disk – Ravan Oct 22 '15 at 08:35
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Also see: http://askubuntu.com/questions/83/how-do-file-permissions-work – Takkat Oct 22 '15 at 09:22
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You can change File/Fodder permissions by Opening up a terminal by pressing Ctrl+Alt+T and typing in
This command will change all sub directory’s and files to read and right to every one.
sudo chmod ugo+wrx /media/external -Rf
Or you can run sudo nautilus
in Terminal this will run nautilus with full rights so you won't have any permission errors when copying files and fodders to an external media.

Neil
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If you want to copy your important data open the file browser (nautilus
) as root :
Open a terminal (Ctrl+Alt+T) and execute :
sudo apt-get install gksudo
When the installation is done :
gksudo dbus-launch nautilus
Copy your files ...
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There is no need to install anything for that task.
sudo -H nautilus
will do. – Pilot6 Oct 22 '15 at 08:33 -