I had the same error messages. When I removed an old print job which was a relict of my gutsy pre-installation time I could use apt-get upgrade again and it finished without any problems. So it seems to be due to old print jobs.
I had the same error messages. When I removed an old print job which was a relict of my gutsy pre-installation time I could use apt-get upgrade again and it finished without any problems. So it seems to be due to old print jobs.