да, действительно, присутствует запись
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sdb5 during installation
UUID=0afc51ed-e49f-4a41-a325-40e58fe1c94a / ext4 errors=remount-ro 0 1
# /home was on /dev/sdb6 during installation
UUID=e02637f0-3901-4f91-a605-0dff11a131b0 /home ext4 defaults 0 2
# swap was on /dev/sdb1 during installation
UUID=04b66f02-b228-415d-9722-2c10b29d700b none swap sw 0 0
/dev/disk/by-id/usb-HTC_Android_Phone_HT23YTV16213-0:1 /mnt/usb-HTC_Android_Phone_HT23YTV16213-0:1 auto nosuid,nodev,nofail,x-gvfs-show 0 0
Спасибо за оперативную помощь.
вроде ничего не монтировал при подключении трубы. хз.