No `dell-linux-assistant` program upgrade

using Dell G3 15 3500 with Ubuntu 20.04.1, impossible to upgrade dell-linux-assistant

sudo apt upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

sudo apt list --upgradable -a
Listing... Done
dell-linux-assistant/bionic 2.2.0545 amd64 [upgradable from: 2.2.0544]
dell-linux-assistant/now 2.2.0544 amd64 [installed,upgradable to: 2.2.0545]

I think this pb come from my actual 20.04.1 come from an upgrade of 18.04!

Please note too impossible to get this upgrade: 20.04.2

According to @NOrbert's request

jrd_10@my-pc:~$ sudo apt-cache policy dell-linux-assistant
dell-linux-assistant:
   Installed: 2.2.0544
   Candidate: 2.2.0545
   Version table:
        2.2.0545 500
            500 http://ppa.launchpad.net/somerville-dla-team/ppa/ubuntu bionic/main amd64 Packages
*** 2.2.0544 100
        100 /var/lib/dpkg/status

I solved this issue by adding a new ppa from “The Somerville-dla team” for the focal variant.

in the terminal:

sudo add-apt-repository ppa:somerville-dla-team/ppa

And deactivated the older ppa somerville-dla-team/ppa/ubuntu bionic main through software & updates (GUI).

after that in the terminal :

sudo apt update && sudo apt full-upgrade

which results in my case:

Er moeten 397 kB aan archieven opgehaald worden.
Na deze bewerking zal er 1.024 B extra schijfruimte gebruikt worden.
Wilt u doorgaan? [J/n] j
Ophalen:1 http://ppa.launchpad.net/somerville-dla-team/ppa/ubuntu focal/main amd64 dell-linux-assistant amd64 2.2.0548 [397 kB]
397 kB opgehaald in 0s (3.064 kB/s)          
(Database wordt ingelezen ... 197398 bestanden en mappen momenteel geïnstalleerd
.)
Uitpakken van .../dell-linux-assistant_2.2.0548_amd64.deb wordt voorbereid...
Bezig met uitpakken van dell-linux-assistant (2.2.0548) over (2.2.0544) ...
Instellen van dell-linux-assistant (2.2.0548) ...

I had to restart the laptop (Dell XPS-13-9310) to get dell assistant running after this.