Comment 3 for bug 738734

Thanks for your report.

The error is
Mar 20 14:51:46 ubuntu ubiquity: mount: block device /dev/sda1 is write-protected, mounting read-only
Mar 20 14:51:46 ubuntu kernel: [ 2463.469275] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
Mar 20 14:51:47 ubuntu partman-auto: Unsupported method '#%s'
Mar 20 14:51:47 ubuntu ubiquity: /lib/partman/display.d/80manual_partitioning: 9: /lib/partman/choose_partition//do_option: not found

Could you please describe the steps you follow to install the system and your system's configuration ?