Hi @Juerg,
thanks a lot, 

I downloaded 

linux-image-unsigned-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb
linux-modules-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb
linux-modules-extra-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb
linux-modules-ipu6-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb
linux-modules-ivsc-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb
linux-modules-iwlwifi-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb

put them in a folder and ran 'sudo dpkg -i *.deb'

and there is some error

Selecting previously unselected package linux-image-unsigned-6.2.0-32-generic.
dpkg: regarding linux-image-unsigned-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb containing linux-image-unsigned-6.2.0-32-generic:
 linux-image-unsigned-6.2.0-32-generic conflicts with linux-image-6.2.0-32-generic
  linux-image-6.2.0-32-generic (version 6.2.0-32.32) is present and installed.

dpkg: error processing archive linux-image-unsigned-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb (--install):
 conflicting packages - not installing linux-image-unsigned-6.2.0-32-generic
(Reading database ... 255755 files and directories currently installed.)
Preparing to unpack linux-modules-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb ...
Unpacking linux-modules-6.2.0-32-generic (6.2.0-32.32+lp2031537) over (6.2.0-32.32) ...
Preparing to unpack linux-modules-extra-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb ...
Unpacking linux-modules-extra-6.2.0-32-generic (6.2.0-32.32+lp2031537) over (6.2.0-32.32) ...
Selecting previously unselected package linux-modules-ipu6-6.2.0-32-generic.
Preparing to unpack linux-modules-ipu6-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb ...
Unpacking linux-modules-ipu6-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Selecting previously unselected package linux-modules-ivsc-6.2.0-32-generic.
Preparing to unpack linux-modules-ivsc-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb ...
Unpacking linux-modules-ivsc-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Selecting previously unselected package linux-modules-iwlwifi-6.2.0-32-generic.
Preparing to unpack linux-modules-iwlwifi-6.2.0-32-generic_6.2.0-32.32+lp2031537_amd64.deb ...
Unpacking linux-modules-iwlwifi-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Setting up linux-modules-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Setting up linux-modules-extra-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Setting up linux-modules-ipu6-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Setting up linux-modules-ivsc-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Setting up linux-modules-iwlwifi-6.2.0-32-generic (6.2.0-32.32+lp2031537) ...
Processing triggers for linux-image-6.2.0-32-generic (6.2.0-32.32) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-6.2.0-32-generic
/etc/kernel/postinst.d/zz-update-grub:
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-6.2.0-32-generic
Found initrd image: /boot/initrd.img-6.2.0-32-generic
Found linux image: /boot/vmlinuz-6.2.0-31-generic
Found initrd image: /boot/initrd.img-6.2.0-31-generic
Found memtest86+ 64bit EFI image: /boot/memtest86+x64.efi
Warning: os-prober will not be executed to detect other bootable partitions.
Systems on them will not be added to the GRUB boot configuration.
Check GRUB_DISABLE_OS_PROBER documentation entry.
Adding boot menu entry for UEFI Firmware Settings ...
done
Errors were encountered while processing:

is there any thing I am missing here?

when i booted from it initramfs shell appeared

I booted from 6.2.0-31