Windows 7 Ubuntu dual-system installation

Windows 7 Ubuntu dual system installation adventure installation process problems. Since the computer was previously owned by others, the partitions were messy and the hard disk was made into a dynamic disk (any partition was allowed, but dual systems were not supported. When there are more than three primary partitions allocated in the window, the system will prompt the conversion to a dynamic disk. At this time, it is best not to be sure to convert unnecessary partitions to logical partitions through diskgenius, otherwise, the dual system cannot be installed .). In diskgenius, all partitions except the primary partition become idle partitions. Therefore, the disk C is overwritten with the missing partition search function. The instance cannot be restarted after it is started. Fortunately, the system disk was fully prepared and inserted into it. After the repair, the partition was magically converted back to a non-dynamic disk, but a partition was lost. However, I have backed up the hard disk before operating it. After restoring the data, the installation was successful by following the link method.