how to solve this error ? and use detachdb? I got the following error 

Error initializing database environment /home/rune/.bitcoin!  
To recover, BACKUP THAT DIRECTORY, then remove everything from it except for wallet.dat.  


when I run bitcoin-qt..
I am using Ubuntu.
back up all the files in .bitcoin.  then delete them all restart the wallet see if it errors.  If it does, re-download / re-install the client otherwise corupt configs.