USB flash drives appear and disappear instantly from Thunar (xfce)

I have a HP Chromebook where i used crouton to install xfce on. Everything is working fine and expected. However when I whenever I plug up a flash drive (64bit formated with NTFS or 265MB formated with FAT32) I see the stick pop-up in the file explorer (Thunar) for a second and then immediately disappear before I could have time to click on it (similar like here ). When I try the sticks in the default ChromeOS they work and are auto-mounted. So I think my issue is that ChromeOS auto-mount the stricks in the background while I´m using xfce. If I try (inside xfce): sudo mount /dev/disk/by-uuid/80F43972F3583C0B /home/user/64GBUSBStick Then I get the error: > Mount is denied because the NTFS volume is already exclusively opened. > The volume may be already mounted, or another software may use it > which could be identified for example by the help of the fuser command However for the FAT32 stick its working ... This might be (sorry if wrong, but I´m not a linux pro) due to the reason that when checking with mount that the devices can be both seen here: /var/host/media/removable/64GB or /var/host/media/removable/265MB However they where still not added to Thunar Did anybody have a solution for that issue? My preferred one would be to keep both auto mount options up and running if possible.