Effectivement, Cœur Noir, je n'avais pas mentionné dans ce post que mes profils et documents divers étaient partagés par xubuntu, kubuntu et Windows. Désolé.
Voici le résultat:
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
cactusd@cactusd-H81H3-EM2:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 198M 1 loop /snap/vlc/365
loop1 7:1 0 141,3M 1 loop /snap/skype/51
loop2 7:2 0 87M 1 loop /snap/core/5145
sda 8:0 0 931,5G 0 disk
├─sda1 8:1 0 100M 0 part /boot/efi
├─sda2 8:2 0 16M 0 part
├─sda3 8:3 0 33,9G 0 part
├─sda4 8:4 0 21G 0 part /
├─sda5 8:5 0 781,3G 0 part /mnt/63D2BE8B784542AB
├─sda6 8:6 0 8,2G 0 part [SWAP]
├─sda7 8:7 0 21,1G 0 part
└─sda10 8:10 0 18,4G 0 part /mnt/066EA9D76EA9C033
sr0 11:0 1 1024M 0 rom
cactusd@cactusd-H81H3-EM2:~$ sudo blkid
[sudo] Mot de passe de cactusd :
/dev/loop0: TYPE="squashfs"
/dev/loop1: TYPE="squashfs"
/dev/loop2: TYPE="squashfs"
/dev/sda1: UUID="FC18-CF6F" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="97dbbad6-1341-11e4-827e-d43d7e6c632f"
/dev/sda2: PARTLABEL="Microsoft reserved partition" PARTUUID="7f1e3c6b-b420-4345-9f0c-957c39f81624"
/dev/sda3: LABEL="Windows10" UUID="D0D46399D4638118" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="f58547c3-87bb-43e0-866a-bb6961321d4c"
/dev/sda4: UUID="2eeddcb8-2d94-4a57-9c56-aebc69aabbb6" TYPE="ext4" PARTUUID="772f41c8-0226-440e-af11-aa8c0186e0ff"
/dev/sda5: LABEL="PartitionPartage" UUID="63D2BE8B784542AB" TYPE="ntfs" PARTUUID="ada396de-57da-4f66-8526-a42f03313e7d"
/dev/sda6: UUID="19320fed-f786-42ed-8497-6612b6f99d67" TYPE="swap" PARTLABEL="Swap" PARTUUID="b0ffe2ad-df70-4d8f-88d9-6f9f5193e979"
/dev/sda7: UUID="57255bf6-3062-4b86-9779-2c53591c157f" TYPE="ext4" PARTUUID="99dd4639-b066-4ce8-874e-cfcada63d3c7"
/dev/sda10: LABEL="profils" UUID="066EA9D76EA9C033" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="cb4eda6f-59b0-4b19-a71e-7684e483bfec"
cactusd@cactusd-H81H3-EM2:~$ cat /etc/fstab
# /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>
# / was on /dev/sda4 during installation
UUID=2eeddcb8-2d94-4a57-9c56-aebc69aabbb6 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
UUID=FC18-CF6F /boot/efi vfat umask=0077 0 1
# swap was on /dev/sda6 during installation
UUID=19320fed-f786-42ed-8497-6612b6f99d67 none swap sw 0 0
/dev/disk/by-uuid/63D2BE8B784542AB /mnt/63D2BE8B784542AB auto nosuid,nodev,nofail,x-gvfs-show 0 0
/dev/disk/by-uuid/066EA9D76EA9C033 /mnt/066EA9D76EA9C033 auto nosuid,nodev,nofail,x-gvfs-show 0 0
cactusd@cactusd-H81H3-EM2:~$
Je viens de vérifier à partir de Windows et je me souviens que l'on m'avait conseillé de le faire: Le démarrage rapide est bien désactivé.