Restore default permissions on /dev/pts

Hey guys I tried to activate multiuser for some screens so I used screen -A -m -d -S test screen -S stest -X multiuser on screen -S test -X acladd testuser But I got chmod /dev/pts/17: Permission denied Unfortunately I thought it would be a great idea to play around with the permissions. Now I´m with the folder it self drwxrw-rw- 2 root sys 0 Jul 10 09:39 pts And the files inside with the following total 0 crw-rw-rw- 1 root sys 136, 0 Aug 4 22:30 0 crw-rw-rw- 1 markus mTeam 136, 1 Aug 1 23:20 1 crw-rw-rw- 1 markus mTeam 136, 10 Jul 24 13:47 10 crw-rw-rw- 1 markus mTeam 136, 11 Jul 27 17:43 11 crw-rw-rw- 1 markus mTeam 136, 12 Aug 4 22:33 12 crw-rw-rw- 1 markus mTeam 136, 13 Aug 4 22:32 13 crw-rw-rw- 1 markus mTeam 136, 14 Aug 4 22:33 14 crw-rw-rw- 1 markus mTeam 136, 15 Jul 27 20:12 15 crw-rw-rw- 1 markus mTeam 136, 16 Aug 4 21:46 16 crwxrwxrwx 1 markus mTeam 136, 17 Aug 4 2021 17 crw-rw-rw- 1 markus mTeam 136, 18 Aug 4 22:07 18 crw-rw-rw- 1 markus mTeam 136, 19 Aug 4 16:29 19 crw-rw-rw- 1 markus mTeam 136, 2 Jul 27 17:43 2 crw-rw-rw- 1 markus mTeam 136, 20 Jul 27 17:37 20 crw-rw-rw- 1 markus mTeam 136, 22 Jul 27 17:43 22 crw-rw-rw- 1 markus mTeam 136, 23 Aug 1 20:16 23 crw-rw-rw- 1 markus mTeam 136, 24 Aug 4 17:55 24 crw-rw-rw- 1 markus mTeam 136, 25 Jul 27 17:43 25 crw-rw-rw- 1 markus mTeam 136, 28 Jul 27 12:29 28 crw-rw-rw- 1 markus mTeam 136, 29 Jul 27 17:43 29 crw-rw-rw- 1 markus mTeam 136, 3 Aug 4 22:24 3 crw-rw-rw- 1 markus mTeam 136, 31 Jul 27 17:43 31 crw-rw-rw- 1 markus mTeam 136, 33 Jul 27 17:43 33 crw-rw-rw- 1 markus mTeam 136, 4 Aug 4 22:33 4 crw-rw-rw- 1 markus mTeam 136, 5 Jul 13 10:01 5 crw-rw-rw- 1 markus mTeam 136, 6 Aug 4 22:14 6 crw-rw-rw- 1 markus mTeam 136, 7 Aug 4 22:14 7 crw-rw-rw- 1 markus mTeam 136, 8 Aug 4 22:33 8 crw-rw-rw- 1 markus mTeam 136, 9 Jul 10 09:41 9 crw-rw-rw- 1 root sys 5, 2 Jul 10 09:39 ptmx On some other pages I have read that the permissions can change and aren't static. And my problem is now that since I changed the permissions I'm not able to create new screens nor operate them. When I use for example: screen -A -m -S test I get Cannot open /dev/pts/27: Permission denied So is there a way to fix my stupid mistake? I'm grateful for every help I get :) I'm using Ubuntu 20.10