Same error experienced,
[EMAIL PROTECTED]:~$ sudo parted /dev/sda print
Model: ATA HITACHI_DK23FB-6 (scsi)
Disk /dev/sda: 60.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End SizeType File system Flags
1 32.3kB 20.0GB 20.0GB primary
After installation,
Model: ATA HITACHI_DK23FB-6 (scsi)
Disk /dev/sda: 60.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End SizeType File system Flags
1 32.3kB 20.0GB 20.0GB primary ntfs boot
2 20.0GB 60.0GB 40.0GB