I'm not familiar with Deepin but you apparently installed its bootloader to the master boot record and it did not create entries for or apparently did not detect the other operating system. Which bootloader does it use? Is it Grub, Grub2, Lilo? Check the /boot/grub directory to verify this. Check for a menu.lst or grub.conf file or a grub.cfg file. Can you run the fdisk command to verify that your partitions for Mint and Opensuse are still there. Probably the best way to get information is to google 'bootinfoscript', go to its site read the instructions in the link in the Description box, download it and run it and post the output, a results.txt file.
I just googled their site and apparently it is derived from Ubuntu so it should have Grub2. You could try running: sudo update-grub in a terminal and watch the output to see if the other OSs are detected.
Last edited by yancek; 07-09-2014 at 10:50 PM.