the case is i want to share a few files and folders between the two local users. I've created a group called share and added both users to it. Rebooted Deepin and then changed the group of the necessary directories to 'share' then used sudo chmod 770 to change permissions to allow the group's members to access the directory and read/modify it's content. However if i want to cd into any of these directories as the other user, it'll fail with the message permission denied. The second user is used in school and for security reasons, it's not in the sudo or the weylyn1 (the group of the home user) group (this is how much i trust my classmates). A few of these files and directories are inside the home director of my home user, the others are on a USB Flash drive's ext2 filesystem, mounted under /mnt/share.
中文 
the case is i want to share a few files and folders between the two local users. I've created a group called share and added both users to it. Rebooted Deepin and then changed the group of the necessary directories to 'share' then used sudo chmod 770 to change permissions to allow the group's members to access the directory and read/modify it's content. However if i want to cd into any of these directories as the other user, it'll fail with the message permission denied. The second user is used in school and for security reasons, it's not in the sudo or the weylyn1 (the group of the home user) group (this is how much i trust my classmates). A few of these files and directories are inside the home director of my home user, the others are on a USB Flash drive's ext2 filesystem, mounted under /mnt/share.