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i had a problem to boot Ubuntu 11.10 after instalation caused by lack of permissions on freshly set partitions (partitions made by disk utility on live CD). I gave all permissions to all files to any user. How i should set it back to work properly with Ubuntu ?

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What command did you run exactly ? If you ran it recursively you will have to reinstall. If you simply ran sudo chmod 777 /home it can be fixed

sudo chmod 755 /home
sudo chmod 755 /

In the future, rather then changing ownership and permissions of system files, use sudo or gksu

gksu nautilus

See also

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