Merci beaucoup pour ta réponse ! voici ce que j'obtiens
nicolas@nicolas-OptiPlex-5050:~$ mount -l | tail
/var/lib/snapd/snaps/chromium_353.snap on /snap/chromium/353 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/core_4830.snap on /snap/core/4830 type squashfs (ro,nodev,relatime,x-gdu.hide)
/var/lib/snapd/snaps/core_4917.snap on /snap/core/4917 type squashfs (ro,nodev,relatime,x-gdu.hide)
/dev/sda1 on /boot/efi type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=802900k,mode=700,uid=1000,gid=1000)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=1000)
tmpfs on /run/snapd/ns type tmpfs (rw,nosuid,noexec,relatime,size=802904k,mode=755)
nsfs on /run/snapd/ns/canonical-livepatch.mnt type nsfs (rw)
/dev/sdb1 on /media/nicolas/2504633536531F58 type fuseblk (rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096,uhelper=udisks2)
/dev/mapper/luks-c8e1a806-0907-441d-9fdd-2e4402b986ae on /media/nicolas/Nico type ext4 (rw,nosuid,nodev,relatime,data=ordered,uhelper=udisks2) [Nico]