So I booted under v4.19 then back to v4.18 and I run the following commands:
$ journalctl -b -1 -p3
-- Logs begin at Fri 2018-07-27 17:18:12 CEST, end at Fri 2018-11-16 18:01:01 CET. --
nov. 16 17:40:35 samspade kernel: watchdog: watchdog0: watchdog did not stop!
$ journalctl -b -1 -g keyboard
-- Logs begin at Fri 2018-07-27 17:18:12 CEST, end at Fri 2018-11-16 18:01:01 CET. --
nov. 16 17:38:40 samspade kernel: audit: type=1130 audit(1542386320.687:9): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=keyboardctl comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:40 samspade kernel: audit: type=1131 audit(1542386320.687:10): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=keyboardctl comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:40 samspade audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=keyboardctl comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:40 samspade audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=keyboardctl comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:40 samspade systemd[1]: Started Setup keyboard layout.
nov. 16 17:38:41 samspade systemd[1]: Starting Setup keyboard layout...
nov. 16 17:38:41 samspade systemd[1]: Started Setup keyboard layout.
nov. 16 17:38:41 samspade audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=keyboardctl comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:41 samspade audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=keyboardctl comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
$ journalctl -b -1 -g udev
-- Logs begin at Fri 2018-07-27 17:18:12 CEST, end at Fri 2018-11-16 18:01:01 CET. --
nov. 16 17:38:40 samspade systemd[1]: Listening on udev Kernel Socket.
nov. 16 17:38:40 samspade kernel: audit: type=1130 audit(1542386320.677:8): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-udev-trigger comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:40 samspade audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-udev-trigger comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:40 samspade audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-udevd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
nov. 16 17:38:40 samspade systemd[1]: Started udev Coldplug all Devices.
nov. 16 17:38:40 samspade systemd[1]: Started udev Kernel Device Manager.
$ journalctl -b -1 -g found
-- Logs begin at Fri 2018-07-27 17:18:12 CEST, end at Fri 2018-11-16 18:01:01 CET. --
nov. 16 17:38:40 samspade kernel: Found optimal setting for mtrr clean up
nov. 16 17:38:40 samspade kernel: found SMP MP-table at [mem 0x000ff780-0x000ff78f] mapped at [(____ptrval____)]
nov. 16 17:38:40 samspade kernel: No NUMA configuration found
nov. 16 17:38:40 samspade kernel: acpi PNP0A08:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
nov. 16 17:38:40 samspade kernel: pnp: PnP ACPI: found 9 devices
nov. 16 17:38:40 samspade kernel: x86/mm: Checked W+X mappings: passed, no W+X pages found.
nov. 16 17:38:40 samspade kernel: x86/mm: Checked W+X mappings: passed, no W+X pages found.
nov. 16 17:38:40 samspade kernel: usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 1-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 2-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb usb3: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 3-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb usb4: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 4-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb usb5: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 5-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb usb6: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 6-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb usb7: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 7-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb usb8: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 4.19
nov. 16 17:38:40 samspade kernel: hub 8-0:1.0: USB hub found
nov. 16 17:38:40 samspade kernel: usb 1-1: New USB device found, idVendor=058f, idProduct=6364, bcdDevice= 1.00
nov. 16 17:38:40 samspade kernel: usb 7-1: New USB device found, idVendor=056a, idProduct=0062, bcdDevice= 2.00
nov. 16 17:38:40 samspade kernel: usb 7-2: New USB device found, idVendor=275d, idProduct=0ba6, bcdDevice= 1.00
nov. 16 17:38:40 samspade kernel: usb 8-2: New USB device found, idVendor=04f3, idProduct=0103, bcdDevice= 1.07
nov. 16 17:38:40 samspade kernel: PM: Image not found (code -22)
nov. 16 17:38:40 samspade kernel: vboxdrv: Found 4 processor cores
nov. 16 17:38:40 samspade kernel: vboxpci: IOMMU not found (not registered)
nov. 16 17:38:41 samspade systemd[1]: Found device Samsung_SSD_850_EVO_250GB Ubuntu.
nov. 16 17:38:41 samspade systemd[1]: Found device Samsung_SSD_850_EVO_250GB home.
nov. 16 17:38:41 samspade systemd[1]: Found device Samsung_SSD_850_EVO_250GB Home.
nov. 16 17:38:41 samspade systemd[1]: Found device WDC_WD40EZRZ-00WN9B0 Video.
nov. 16 17:38:41 samspade systemd[1]: Found device Samsung_SSD_850_EVO_250GB VBMachines.
nov. 16 17:38:41 samspade systemd[1]: Found device TOSHIBA_HDWE160 LinSwap.
nov. 16 17:38:41 samspade systemd[1]: Found device TOSHIBA_HDWE160 BackupC.
nov. 16 17:38:41 samspade systemd[1]: Found device WDC_WD40EZRZ-00WN9B0 Photos.
nov. 16 17:38:41 samspade systemd[1]: Found device WDC_WD40EZRZ-00WN9B0 GrosFichiers.
nov. 16 17:38:41 samspade systemd[1]: Found device TOSHIBA_HDWE160 BackupJ.
nov. 16 17:38:41 samspade systemd[1]: Found device TOSHIBA_HDWE160 Partage.
nov. 16 17:38:41 samspade systemd[1]: Found device WDC_WD40EZRZ-00WN9B0 Audio.
nov. 16 17:38:41 samspade kernel: iTCO_wdt: Found a ICH10 TCO device (Version=2, TCOBASE=0x0860)
nov. 16 17:38:41 samspade kernel: nouveau 0000:01:00.0: bios: M0203T not found
nov. 16 17:38:49 samspade avahi-daemon[632]: Found user 'avahi' (UID 993) and group 'avahi' (GID 993).
nov. 16 17:38:49 samspade avahi-daemon[632]: No service file found in /etc/avahi/services.
nov. 16 17:38:49 samspade NetworkManager[631]: <info> [1542386329.8686] rfkill0: found WiFi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/ieee80211/phy0/rfkill0) (driver ath9k)
nov. 16 17:40:14 samspade python[1368]: backintime (sspadem/1): WARNING: Command "rsync -rtDHh --links --no-p --no-g --no-o --info=progress2 --no-i-r --delete --delete-excluded -i --dry-run --out-format="BACKINTIME: %i %n%L" --chmod=Du+wx --exclude="/mnt/BackupC" --exclude="/home/sspadem/.local/share/backintime" --exclude=".local/share/backintime/mnt" --include="/Home/sspade/Codes/" --include="/Home/sspade/" --include="/Home/" --include="/Home/sspade/Doc/" --include="/Home/sspade/Scripts/" --include="/mnt/Photos/" --include="/mnt/" --include="/mnt/Audio/" --include="/mnt/GrosFichiers/TV/" --include="/mnt/GrosFichiers/" --include="/mnt/GrosFichiers/Films/Pourquoi Israel/" --include="/mnt/GrosFichiers/Films/" --include="/Home/sspade/amsn/" --include="/Home/sspade/Bibliothèque calibre/" --include="/home/sspadeu18/" --include="/home/" --exclude="*[tT]humb*" --exclude="*[tT][eE]?[mM][pP]*" --exclude="*[cC]ache*" --exclude="*lost+found*" --exclude=".gvfs" --exclude="System Volume Information"