Kubuntu 24.04 /w zabbly 6.15.7 kernel

Logs in with x11. I attempted re-install, "DisplayLink Lenovo LT1421 wide", is still not working. It turns on during boot but turns off shortly after, I have to un-plug and plug it then it stays on but still doesn't work. .

When I first installed OS fresh, DisplayLink was working withOUT installing ANY drivers.
I ran this command "sudo ubuntu-drivers autoinstall" and was no longer able to boot. I used a -1 prior zfs snapshot of system ROOT to boot but from there onward the LT1421 ceased to ever function. I proceeded to blacklist nouveau drivers and install nvidia-desktop-575, which is working fine. I tried the apt & .run install methods of synaptics driver, uninstalled both and found this git and attempted it also, to no avail.
... I attempted booting with generic kernel "vmlinuz-6.8.0-64-generic" to attempt another re-install but wasn't able to boot so I set it back..

I manually started the displaylink service after I saw blank status on first run of -- debug, it was originally inactive/dead. Even if I started the service, if I log out and log back in, its "enabled" but inactive/dead ::
--------------- Linux system info ----------------

Distro: Ubuntu
Release: noble
Kernel: 6.15.7-zabbly+

---------------- DisplayLink info ----------------

Driver version: 1.14.10
DisplayLink service status: up and running
EVDI service version: 1.14.10

------------------ Graphics card -----------------

Vendor: nvidia
Subsystem: [GeForce
VGA: NVIDIA Corporation GP104BM [GeForce GTX 1070 Mobile] (rev a1)
VGA (3D):
X11 version: 21.1.12-1ubuntu1.4
X11 configs: /etc/X11/xorg.conf /etc/X11/xorg.conf.d/20-displaylink.conf

-------------- DisplayLink xorg.conf -------------

File: /etc/X11/xorg.conf.d/20-displaylink.conf
Contents:
Section "ServerLayout"
Identifier "layout"
Screen 0 "nvidia"
Inactive "intel"
EndSection

Section "Device"
Identifier "intel"
Driver "modesetting"
Option "AccelMethod" "None"
EndSection

Section "Screen"
Identifier "intel"
Device "intel"
EndSection

Section "Device"
Identifier "nvidia"
Driver "nvidia"
Option "ConstrainCursor" "off"
EndSection

Section "Screen"
Identifier "nvidia"
Device "nvidia"
Option "AllowEmptyInitialConfiguration" "on"
Option "IgnoreDisplayDevices" "CRT"
EndSection

-------------------- Monitors --------------------

Providers: number : 5
Provider 0: id: 0x1b7 cap: 0x1, Source Output crtcs: 4 outputs: 6 associated providers: 4 name:NVIDIA-0
Provider 1: id: 0x283 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting
Provider 2: id: 0x262 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting
Provider 3: id: 0x241 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting
Provider 4: id: 0x220 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting

make log (different directory) ::
/var/lib/dkms/evdi/1.14.10/6.15.7-zabbly+/x86_64/log$ cat make.log
...Skipping BTF generation for evdi.ko due to unavailability of vmlinux
make[2]: Leaving directory '/var/lib/dkms/evdi/1.14.10/build'
make[1]: Leaving directory '/usr/src/linux-headers-6.15.7-zabbly+'

"common issues" fix make attempt , I pre-installed libssl-dev ::
tar: /usr/src/linux-source-6.15.tar.xz: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
HOSTCC scripts/basic/fixdep
scripts/Makefile.build:37: scripts/kconfig/Makefile: No such file or directory
make[2]: *** No rule to make target 'scripts/kconfig/Makefile'. Stop.
make[1]: *** [/usr/src/linux-headers-6.15.7-zabbly+/Makefile:730: oldconfig] Error 2
make: *** [Makefile:248: __sub-make] Error 2
'***
'*** Configuration file ".config" not found!
'***
'*** Please run some configurator (e.g. "make oldconfig" or
'*** "make menuconfig" or "make xconfig").
'***
/usr/src/linux-headers-6.15.7-zabbly+/Makefile:808: include/config/auto.conf.cmd: No such file or directory
make[1]: *** [/usr/src/linux-headers-6.15.7-zabbly+/Makefile:817: .config] Error 1
make: *** [Makefile:248: __sub-make] Error 2

while attempting re-install, jik ::
evdi.ko:
Running module version sanity check.
- Original module
- No original module exists within this kernel
- Installation
- Installing to /lib/modules/6.15.7-zabbly+/updates/dkms/
depmod...

DisplayLink evdi module installed successfully.

Start by reviewing the DisplayLink service status and the configuration in /etc/X11/xorg.conf.d/20-displaylink.conf, then inspect the DKMS evdi make.log for kernel 6.15.7-zabbly+. Reproduce the login and replug behavior on the reported Ubuntu Noble, NVIDIA, and Lenovo LT1421 setup; done means the display remains active after login without manual service intervention.

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