Mounts per user [ ntfs issue ]

Edit

Now I'm sure

I wasn't doning anything wrong

I understood that I could set oartitions from settings > removable storage > removable devices to be mounted automatically or not

this is sessin based and not startup based

Now the only proplem is to give mount ablity of ntfs to non sudoer user without a sudoer user password

users within plugdev group are able to mount ext4 and fat without sudoer password but not ntfs, user must provide a password of a superuser and we are creating these users for not to provide system adminstraion for other users

Original question

System

• UbuntuStudio
• 22.04
• Plasma-desktop

problem

I have 4 users [manager, worker, renter, guest]

I tried to manage these resources [root fn, app install, printers, storage, web]

1. Manager is the default user added while installation
2. Worker should not have access to [root functions, app install]
3. Renter should only have access to [printers, storage, web]
4. Renter should only have access to [web]

Every thing goes well using groups exept storage mount:

1. ntfs : don't mount unless user provide a sudoer user
2. fat,ext : mounts automatically on user login exept manager that has it with the configured behavior [only mount when prompted]

what I tried

• I created a new group for mounting data

  sudo groupadd mnt-grp;
  

• I got the new group gid and nobody user uid

  getent group | grep mnt-grp;
  # mnt-grp:x:xxxx ...
  
  getent passwd | grep nobody;
  # nobody:x:yyyyy: ...
  

• added every user to this group and plugdev one as needed

  sudo usermod -aG plugdev $USER; 
  sudo usermod -aG mnt-grp $USER; 
  

• changed the fstab to be like this

  UUID=[ext-uuid] /mnt/[mnt-point] ext4 x-gvfs-show,nosuid,nodev,nofail,users,user=nobody,gid=[xxxx] 0 0
  
  UUID=[fat-uuid] /mnt/[mnt-point] auto x-gvfs-show,nosuid,nodev,nofail,noauto,users,uid=[yyyyy],gid=[xxxxx] 0 0
  
  UUID=[ntfs-uuid] /mnt/[mnt-point] auto nosuid,nodev,nofail,x-gvfs-show,noauto 0 0
  

  uid,gid,user,user=xxx,users makes error on mount

• changed the own of /mnt/ and all its members to nobody:mnt-grp

  sudo chown -R nobody:mnt-grp .;
  

setiuation

• I need to reduce splash screen time by stopping mount unless requested,
• only a perimted users (plugdev members) could mount
• and only specified users (mnt-grp member) could have access

every plugdev member is added as part of mnt-grp

drives is needed as ntfs and format is not an option

• I need to know at least what I'm doing wrong