header_postinst.d/dkms exited with return code 4

Error 
 /etc/kernel/header_postinst.d/dkms: Error! Could not locate dkms.conf file. File:  does not exist. run-parts: /etc/kernel/header_postinst.d/dkms exited with return code 4 
 Lösung 
 for i in /var/lib/dkms/*/[^k]*/source; do [ -e "$i" ] || echo "$i";done 
 Output:     

 /var/lib/dkms/******-123/340.106/source 
 sudo rm -Rf /var/lib/dkms/******-123/340.106/source
sudo apt upgrade