today i installed nothing than ubuntu daily software update that happens once a day but I see two small size volume on the left pane of nautilus (120mb and 52mb). till now i only see such thing when i insert usb flash disk or phone into pc. the structure of files on these volumes are very similar to ubuntu root folder. trying losetup -a show many of these loop devices but the 2 visible devices in nautilus are:
/dev/loop36: []: (/var/lib/snapd/snaps/snapd_17576.snap (deleted))
/dev/loop6: []: (/var/lib/snapd/snaps/core_14056.snap (deleted))
how can i fix this? here is the nautilus screenshot