**[EDIT]**Update to 6.8.0-54 kernel today, then no network connection.
Forced to back to previous kernel (6.8.0-53) to get network connection.
There is docs.ubuntu.com with Netplan, maybe something broken: netplan status, but if some ppp connection needed there is NM for that, broken modules or such things is often out of tree modules… You have your connection provider, it should know what to do even if not on BBS boards yet 
and if that case The Linux Documentation Project is in revival since 2000 era…
What results from terminal for dpkg -l | grep 6.8.0-53
Oh sorry I mixed up -54 and -53 ! (I edited the thread)
So no network connection, since 6.8.0-54 .
And 6.8.0-53 (and previous) is working.
:~$ dpkg -l | grep 6.8.0-53
ii linux-headers-6.8.0-53 6.8.0-53.55 all Header files related to Linux kernel version 6.8.0
ii linux-headers-6.8.0-53-generic 6.8.0-53.55 amd64 Linux kernel headers for version 6.8.0 on 64 bit x86 SMP
ii linux-image-6.8.0-53-generic 6.8.0-53.55 amd64 Signed kernel image generic
ii linux-modules-6.8.0-53-generic 6.8.0-53.55 amd64 Linux kernel extra modules for version 6.8.0 on 64 bit x86 SMP
ii linux-modules-extra-6.8.0-53-generic 6.8.0-53.55 amd64 Linux kernel extra modules for version 6.8.0 on 64 bit x86 SMP
ii linux-modules-nvidia-470-6.8.0-53-generic 6.8.0-53.55+1 amd64 Linux kernel nvidia modules for version 6.8.0-53
ii linux-objects-nvidia-470-6.8.0-53-generic 6.8.0-53.55+1 amd64 Linux kernel nvidia modules for version 6.8.0-53 (objects)
ii linux-signatures-nvidia-6.8.0-53-generic 6.8.0-53.55+1 amd64 Linux kernel signatures for nvidia modules for version 6.8.0-53-generic
ii linux-tools-6.8.0-53 6.8.0-53.55 amd64 Linux kernel version specific tools for version 6.8.0-53
ii linux-tools-6.8.0-53-generic 6.8.0-53.55 amd64 Linux kernel version specific tools for version 6.8.0-53
Ans the no working one:
:~$ dpkg -l | grep 6.8.0-54
ii linux-image-6.8.0-54-generic 6.8.0-54.56 amd64 Signed kernel image generic
ii linux-libc-dev:amd64 6.8.0-54.56 amd64 Linux Kernel Headers for development
ii linux-modules-6.8.0-54-generic 6.8.0-54.56 amd64 Linux kernel extra modules for version 6.8.0 on 64 bit x86 SMP
ii linux-modules-nvidia-470-6.8.0-54-generic 6.8.0-54.56 amd64 Linux kernel nvidia modules for version 6.8.0-54
ii linux-modules-nvidia-470-generic 6.8.0-54.56 amd64 Extra drivers for nvidia-470 for the generic flavour
ii linux-objects-nvidia-470-6.8.0-54-generic 6.8.0-54.56 amd64 Linux kernel nvidia modules for version 6.8.0-54 (objects)
ii linux-signatures-nvidia-6.8.0-54-generic 6.8.0-54.56 amd64 Linux kernel signatures for nvidia modules for version 6.8.0-54-generic
ii linux-tools-common 6.8.0-54.56 all Linux kernel version specific tools for version 6.8.0
And for netplan status (from working -53):
:~$ netplan status
Online state: online
DNS Addresses: 127.0.0.53 (stub)
DNS Search: home
â—Ź 1: lo ethernet UNKNOWN/UP (unmanaged)
MAC Address: 00:00:00:00:00:00
Addresses: 127.0.0.1/8
::1/128
â—Ź 2: enp2s0 ethernet UP (unmanaged)
MAC Address: 40:8d:5c:d9:ef:97 (Realtek Semiconductor Co., Ltd.)
Addresses: 192.168.1.12/24 (dynamic, dhcp)
2a01:cb14:2c3:a900:451:ef37:af39:f6c4/64 (dynamic, ra)
2a01:cb14:2c3:a900:cc7f:6715:40b1:1756/64 (dynamic, ra)
fe80::6826:3db8:6262:b397/64 (link)
DNS Addresses: 192.168.1.1
2a01:cb14:2c3:a900:3e58:5dff:fe00:9c80
fe80::3e58:5dff:fe00:9c80
DNS Search: home
Routes: default via 192.168.1.1 from 192.168.1.12 metric 100 (dhcp)
192.168.1.0/24 from 192.168.1.12 metric 100 (link)
2a01:cb14:2c3:a900::/64 metric 100 (ra)
fe80::/64 metric 1024
default via fe80::3e58:5dff:fe00:9c80 metric 100 (ra)
In terminal from the working kernel sudo apt install linux-modules-extra-6.8.0-54-generic then reboot
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You’re right, that’s it.
Why is it missing ? (no problem on previous kernel update)
Do you have the linux-generic package installed ? that is the top-level metapackage for all kernel bits and should usually care for getting all depending other kernel packages upgraded during updates …
Ok. Now I see: linux-generic was missing because of a deal with amd64-micro code after cpu change. All right now, thanks all.
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