It seems that the file has been locked during the upgrade and the process has not unlocked it for use. Also do apt-get install lslk and use lslk /etc/services to see what processes have locked the file.
It seems that the file has been locked during the upgrade and the process has not unlocked it for use. Also do apt-get install lslk and use lslk /etc/services to see what processes have locked the file.