Cannot start session without errors in phpMyAdmin
Problem usually lies on your browser end.
You need to flush your browser cache, delete the cookies for the server/host and then retry loading phpMyAdmin.
If you want to go all out, clear out the session folder on the server as well.
One possible reason for this is a session data mismatch between the browser and the webserver causing it to not be able to pull out the required session info and dumping this error dialogue on your lap.
Cannot start session without errors in phpMyAdmin, session variables don't work
I agree with bansi:
it looks like you have wrong permission for /var/lib/php5/session it
should be drwxrwxr-t or dr-xrwxr-t (assuming www-data is the web
server user). Write permission is required in the directory to save
session data.
Also, you should check the log files in /var/log/ of PHP (and maybe Apache as well) - they might give you some more details...
Phpmyadmin: Error when visiting localhost/phpmyadmin session start
Check your php.ini file and look for session.save_path = "/var/lib/php/session" it has to be there.
make sure the path exists.
Try clearing your browser's cache and cookies
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