This is occurring quite frequently in Ubuntu 13.04 as we can see in the error tracker - https://errors.ubuntu.com/problem/6c6e58622198dbb4577349d83c9d6cf27a149f60
This is occurring quite frequently in Ubuntu 13.04 as we can see in the error tracker - https:/ /errors. ubuntu. com/problem/ 6c6e58622198dbb 4577349d83c9d6c f27a149f60