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Warning: Cannot modify header information - headers already sent by (output started at /opt/lampp/htdocs/index.php:3) in /opt/lampp/htdocs/lib/sid.php on line 47

Warning: Cannot modify header information - headers already sent by (output started at /opt/lampp/htdocs/index.php:3) in /opt/lampp/htdocs/index.php on line 102

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I change OS from Windows to Ubuntu.. I put in htdocs the same files that I used in winzoz...

For the permission I set "Others" to read and write.

there is a space after ?> in the named files. Open the files with a editor and remove the space