Hello,
I cannot boot my computer and the "Could not write bytes: broken pipe" message appears.
Some information:
Computer: dell with nvidia. Ubuntu 12.04LTS 64 bits

Disk /dev/sda: 640.1 GB, 640135028736 bytes
255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x1f0c667f

Device Boot Start End Blocks Id System
/dev/sda1 2048 206847 102400 de Dell Utility
/dev/sda2 * 206848 30926847 15360000 7 HPFS/NTFS/exFAT
/dev/sda3 30926848 133326847 51200000 7 HPFS/NTFS/exFAT
/dev/sda4 133328894 1250263039 558467073 5 Extended
Partition 4 does not start on physical sector boundary.
/dev/sda5 1242357760 1250263039 3952640 82 Linux swap / Solaris
/dev/sda6 296554496 1242353663 472899584 83 Linux
/dev/sda7 133328896 296552447 81611776 83 Linux

Partition table entries are not in disk order

I've tried without any success.....

Through the recovery mode: Repair broken packages.

By Purging nvidia and re-installing it again

rm .Xauthoroty didn't work

I tried to use the nano editor (sudo nano -w) to delete a supossed failed var/lib/dpg/status and didn't know how....

At the moment, I'm using this live-cd to try to solve this.

Thankyou.