Bonjour,
Si cela peut aider à trouver d'où vient ce problème, je rencontre un problème similaire, mais sur un Dell plus récent encore, acheté en avril 2020, installation d'entrée de jeu d'Ubuntu 20.04, donc sans upgrade depuis la 18.04. Jusqu'hier, pas de problème et désormais je suis obligé de choisir d'utiliser la version 5.4.0-26-generic pour démarrer car la 37 bloque au même endroit qu'Armanio: "Chargement du disque mémoire initial" (je n'ai pas essayé la 33).
Le retour des commandes est le suivant :
echo; dpkg -l | grep -Ei "linux-(g|h|i|lo|mo|si|t)" | grep -v ^rc | sort -k3 | awk '{print $1,$2,$3,$4}' | column -s" " -t ; echo ; uname -mr
ii binutils-x86-64-linux-gnu 2.34-6ubuntu1 amd64
ii linux-headers-5.4.0-26 5.4.0-26.30 all
ii linux-modules-5.4.0-26-generic 5.4.0-26.30 amd64
ii linux-modules-extra-5.4.0-26-generic 5.4.0-26.30 amd64
ii linux-headers-5.4.0-26-generic 5.4.0-26.30 amd64
ii linux-image-5.4.0-26-generic 5.4.0-26.30 amd64
ii linux-headers-5.4.0-33 5.4.0-33.37 all
ii linux-modules-5.4.0-33-generic 5.4.0-33.37 amd64
ii linux-modules-extra-5.4.0-33-generic 5.4.0-33.37 amd64
ii linux-headers-5.4.0-33-generic 5.4.0-33.37 amd64
ii linux-image-5.4.0-33-generic 5.4.0-33.37 amd64
ii linux-generic-hwe-20.04 5.4.0.37.40 amd64
ii linux-headers-generic-hwe-20.04 5.4.0.37.40 amd64
ii linux-image-generic-hwe-20.04 5.4.0.37.40 amd64
ii linux-headers-5.4.0-37 5.4.0-37.41 all
ii linux-modules-5.4.0-37-generic 5.4.0-37.41 amd64
ii linux-modules-extra-5.4.0-37-generic 5.4.0-37.41 amd64
ii linux-headers-5.4.0-37-generic 5.4.0-37.41 amd64
ii linux-image-5.4.0-37-generic 5.4.0-37.41 amd64
5.4.0-26-generic x86_64
Et le sources list :
/etc/apt/sources.list
1 #deb cdrom:[Ubuntu 20.04 LTS _Focal Fossa_ - Release amd64 (20200423)]/ focal main restricted
2
3 # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
4 # newer versions of the distribution.
5 deb http://fr.archive.ubuntu.com/ubuntu/ focal main restricted
6 # deb-src http://fr.archive.ubuntu.com/ubuntu/ focal main restricted
7
8 ## Major bug fix updates produced after the final release of the
9 ## distribution.
10 deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates main restricted
11 # deb-src http://fr.archive.ubuntu.com/ubuntu/ focal-updates main restricted
12
13 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
14 ## team. Also, please note that software in universe WILL NOT receive any
15 ## review or updates from the Ubuntu security team.
16 deb http://fr.archive.ubuntu.com/ubuntu/ focal universe
17 # deb-src http://fr.archive.ubuntu.com/ubuntu/ focal universe
18 deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates universe
19 # deb-src http://fr.archive.ubuntu.com/ubuntu/ focal-updates universe
20
21 ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
22 ## team, and may not be under a free licence. Please satisfy yourself as to
23 ## your rights to use the software. Also, please note that software in
24 ## multiverse WILL NOT receive any review or updates from the Ubuntu
25 ## security team.
26 deb http://fr.archive.ubuntu.com/ubuntu/ focal multiverse
27 # deb-src http://fr.archive.ubuntu.com/ubuntu/ focal multiverse
28 deb http://fr.archive.ubuntu.com/ubuntu/ focal-updates multiverse
29 # deb-src http://fr.archive.ubuntu.com/ubuntu/ focal-updates multiverse
30
31 ## N.B. software from this repository may not have been tested as
32 ## extensively as that contained in the main release, although it includes
33 ## newer versions of some applications which may provide useful features.
34 ## Also, please note that software in backports WILL NOT receive any review
35 ## or updates from the Ubuntu security team.
36 deb http://fr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
37 # deb-src http://fr.archive.ubuntu.com/ubuntu/ focal-backports main restricted universe multiverse
38
39 ## Uncomment the following two lines to add software from Canonical's
40 ## 'partner' repository.
41 ## This software is not part of Ubuntu, but is offered by Canonical and the
42 ## respective vendors as a service to Ubuntu users.
43 # deb http://archive.canonical.com/ubuntu focal partner
44 # deb-src http://archive.canonical.com/ubuntu focal partner
45
46 deb http://security.ubuntu.com/ubuntu focal-security main restricted
47 # deb-src http://security.ubuntu.com/ubuntu focal-security main restricted
48 deb http://security.ubuntu.com/ubuntu focal-security universe
49 # deb-src http://security.ubuntu.com/ubuntu focal-security universe
50 deb http://security.ubuntu.com/ubuntu focal-security multiverse
51 # deb-src http://security.ubuntu.com/ubuntu focal-security multiverse
52
53 # This system was installed using small removable media
54 # (e.g. netinst, live or single CD). The matching "deb cdrom"
55 # entries were disabled at the end of the installation process.
56 # For information about how to configure apt package sources,
57 # see the sources.list(5) manual.
Merci et bonne journée !