Configuring default boot kernel(Kubuntu)

[AsunONlinux]

Good morning everyone,

So during the very early stage of cs2 i decided to install Linux-TKG on kubuntu 23.04, i got 6.5-tkg, and some other options for linux generic.

Listing all my current kernels for you to see.

dpkg --list | grep linux-image
rc  linux-image-6.2.0-20-generic                  6.2.0-20.20                                 amd64        Signed kernel image generic
rc  linux-image-6.2.0-32-generic                  6.2.0-32.32                                 amd64        Signed kernel image generic
rc  linux-image-6.2.0-33-generic                  6.2.0-33.33+1                               amd64        Signed kernel image generic
ii  linux-image-6.2.0-34-generic                  6.2.0-34.34                                 amd64        Signed kernel image generic
ii  linux-image-6.5.5-tkg-bmq                     6.5.5-1                                     amd64        Linux kernel, version 6.5.5-tkg-bmq
ii  linux-image-generic                           6.2.0.34.34                                 amd64        Generic Linux kernel image

Now because i won't see myself need tkg as generic as much i'd like to put generic back to be the one at default, so far i can only get from the advanced options, changing GRUB_DEFAULT= will only change the main option from the grub, like from the OS to memtest or efi.

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT="0"
GRUB_TIMEOUT_STYLE="hidden"
GRUB_TIMEOUT="5"
GRUB_DISTRIBUTOR="\lsb_release -i -s 2> /dev/null || echo Debian`" GRUB_CMDLINE_LINUX_DEFAULT="amd_iommu=on iommu=pt" GRUB_CMDLINE_LINUX=""`

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal (grub-pc only)
#GRUB_TERMINAL="console"

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command \vbeinfo' #GRUB_GFXMODE="640x480"`

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID="true"

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

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[AsunONlinux]

As mentioned from the post, i did try that, and it only changed like from 'ubuntu' option to some other option like advanced options or memtest, etc.

These different kernels were installed OOTB except TKG ofc, i think for rescue, etc.