Not using latest kernel even after updating

[WharfRat]

That could explain the problem

Out of curiosity what does dpkg -S $(which update-grub) show

[UnwantedArun]

That could explain the problem

Out of curiosity what does dpkg -S $(which update-grub) show

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dpkg -S $(which update-grub)
grub2-common: /usr/sbin/update-grub

I've uninstalled that grub-customizer, updated grub and rebooted.
Still the same.

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uname -r
4.15.0-33-generic

[WharfRat]

What about ls -lh /{boot,lib/modules}

[UnwantedArun]

What about ls -lh /{boot,lib/modules}

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ls -lh /{boot,lib/modules}
/boot:
total 214M
-rw-r--r-- 1 root root 1.5M Apr 24  2018 abi-4.15.0-20-generic
-rw-r--r-- 1 root root 1.5M Aug 15 18:20 abi-4.15.0-33-generic
-rw-r--r-- 1 root root 1.5M Sep 24 19:38 abi-4.15.0-36-generic
-rw-r--r-- 1 root root 1.5M Oct 10 14:50 abi-4.15.0-38-generic
-rw-r--r-- 1 root root 212K Apr 24  2018 config-4.15.0-20-generic
-rw-r--r-- 1 root root 212K Aug 15 18:20 config-4.15.0-33-generic
-rw-r--r-- 1 root root 212K Sep 24 19:38 config-4.15.0-36-generic
-rw-r--r-- 1 root root 212K Oct 10 14:50 config-4.15.0-38-generic
drwx------ 3 root root 2.0K Jan  1  1970 efi
drwxr-xr-x 6 root root 4.0K Oct 24 08:08 grub
-rw-r--r-- 1 root root  56M Oct 10 16:05 initrd.img-4.15.0-33-generic
-rw-r--r-- 1 root root  56M Oct 10 11:21 initrd.img-4.15.0-36-generic
-rw-r--r-- 1 root root  56M Oct 23 06:23 initrd.img-4.15.0-38-generic
-rw-r--r-- 1 root root 179K Jan 28  2016 memtest86+.bin
-rw-r--r-- 1 root root 181K Jan 28  2016 memtest86+.elf
-rw-r--r-- 1 root root 181K Jan 28  2016 memtest86+_multiboot.bin
-rw-r--r-- 1 root root    0 Apr 24  2018 retpoline-4.15.0-20-generic
-rw-r--r-- 1 root root    0 Aug 15 18:20 retpoline-4.15.0-33-generic
-rw-r--r-- 1 root root    0 Sep 24 19:38 retpoline-4.15.0-36-generic
-rw-r--r-- 1 root root    0 Oct 10 14:50 retpoline-4.15.0-38-generic
-rw------- 1 root root 3.9M Apr 24  2018 System.map-4.15.0-20-generic
-rw------- 1 root root 3.9M Aug 15 18:20 System.map-4.15.0-33-generic
-rw------- 1 root root 3.9M Sep 24 19:38 System.map-4.15.0-36-generic
-rw------- 1 root root 3.9M Oct 10 14:50 System.map-4.15.0-38-generic
-rw------- 1 root root 7.9M Aug 15 18:27 vmlinuz-4.15.0-33-generic
-rw------- 1 root root 7.9M Sep 24 21:24 vmlinuz-4.15.0-36-generic
-rw------- 1 root root 7.9M Oct 10 16:13 vmlinuz-4.15.0-38-generic

/lib/modules:
total 16K
drwxr-xr-x 5 root root 4.0K Oct  2 14:48 4.15.0-20-generic
drwxr-xr-x 5 root root 4.0K Oct 10 16:05 4.15.0-33-generic
drwxr-xr-x 5 root root 4.0K Oct 10 11:20 4.15.0-36-generic
drwxr-xr-x 5 root root 4.0K Oct 23 06:22 4.15.0-38-generic

[WharfRat]

Open update manager, kernels and remove 4.15.0-20-generic.

There's no vmlinuz or initrd.img for it

[UnwantedArun]

Open update manager, kernels and remove 4.15.0-20-generic.

There's no vmlinuz or initrd.img for it

4.15.0-20 is not installed in my system.

[all41]

You have some top notch help offered here.
I would just say that there is a dominant grub. And this dominate grub is the one last addressed as:
sudo install-grub.
Find where all grub instances are installed via this terminal inquiry:

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 sudo fdisk -l 2>/dev/null | egrep "Disk /|/dev/" | sed "s#^/dev/#Part /dev/#" | awk '{print $2}' | sed 's/://' | xargs -n1 -IX sudo sh -c "hexdump -v -s 0x80 -n  2 -e '2/1 \"%x\" \"\\n\"' X | xargs -n1 -IY sh -c \"case  \"Y\" in '48b4') echo X: GRUB 2 v1.96 ;; 'aa75' | '5272') echo X: GRUB Legacy ;; '7c3c') echo X: GRUB 2 v1.97 or v1.98 ;; '020') echo X: GRUB 2 v1.99 ;; *) echo X: No GRUB Y ;; esac\""

Be sure to copy/paste the entire inquiry.
When booted into Mint then enter:
sudo install grub /dev sdX
Where sdX is the actual location

[UnwantedArun]

You have some top notch help offered her.
I would just say that there is a dominant grub. And this dominate grub is the one last addressed as:
sudo install-grub.
Find where all grub instances are installed via this terminal inquiry:

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 sudo fdisk -l 2>/dev/null | egrep "Disk /|/dev/" | sed "s#^/dev/#Part /dev/#" | awk '{print $2}' | sed 's/://' | xargs -n1 -IX sudo sh -c "hexdump -v -s 0x80 -n  2 -e '2/1 \"%x\" \"\\n\"' X | xargs -n1 -IY sh -c \"case  \"Y\" in '48b4') echo X: GRUB 2 v1.96 ;; 'aa75' | '5272') echo X: GRUB Legacy ;; '7c3c') echo X: GRUB 2 v1.97 or v1.98 ;; '020') echo X: GRUB 2 v1.99 ;; *) echo X: No GRUB Y ;; esac\""

Be sure to copy/paste the entire inquiry.
When booted into Mint then enter:
sudo install grub /dev sdX
Where sdX is the actual location

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  sudo fdisk -l 2>/dev/null | egrep "Disk /|/dev/" | sed "s#^/dev/#Part /dev/#" | awk '{print $2}' | sed 's/://' | xargs -n1 -IX sudo sh -c "hexdump -v -s 0x80 -n  2 -e '2/1 \"%x\" \"\\n\"' X | xargs -n1 -IY sh -c \"case  \"Y\" in '48b4') echo X: GRUB 2 v1.96 ;; 'aa75' | '5272') echo X: GRUB Legacy ;; '7c3c') echo X: GRUB 2 v1.97 or v1.98 ;; '020') echo X: GRUB 2 v1.99 ;; *) echo X: No GRUB Y ;; esac\""
[sudo] password for loozer: 
/dev/sda: No GRUB 00
/dev/sda1: No GRUB 6f6f
/dev/sda2: No GRUB 55aa
/dev/sda3: No GRUB f6c1
/dev/sda4: No GRUB 55aa
/dev/sda5: No GRUB 8cd
/dev/sda6: No GRUB 00
/dev/sda7: No GRUB 00

My linux partition is /dev/sda7. So i should install it in sda7 right ?

[WharfRat]

4.15.0-20 is not installed in my system.

You have remnant leftover files and a /lib/modules folder for 4.15.0-20

Does this return anything
dpkg -S /boot/{System.map-4.15.0-20-generic,retpoline-4.15.0-20-generic,config-4.15.0-20-generic,abi-4.15.0-20-generic}|awk '{print $1}'|uniq

[UnwantedArun]

4.15.0-20 is not installed in my system.

You have remnant leftover files and a /lib/modules folder for 4.15.0-20

Does this return anything
dpkg -S /boot/{System.map-4.15.0-20-generic,retpoline-4.15.0-20-generic,config-4.15.0-20-generic,abi-4.15.0-20-generic}|awk '{print $1}'|uniq

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dpkg -S /boot/{System.map-4.15.0-20-generic,retpoline-4.15.0-20-generic,config-4.15.0-20-generic,abi-4.15.0-20-generic}|awk '{print $1}'|uniq
dpkg-query: no path found matching pattern /boot/System.map-4.15.0-20-generic
dpkg-query: no path found matching pattern /boot/retpoline-4.15.0-20-generic
dpkg-query: no path found matching pattern /boot/config-4.15.0-20-generic
dpkg-query: no path found matching pattern /boot/abi-4.15.0-20-generic

[UnwantedArun]

Guys... Please find a solution !!!

[DAMIEN1307]

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sudo apt purge 4.15.0-20

Kernel and other Cleanups after Deletions

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sudo apt autoremove

do these one at a time, dont worry if the first "dpkg -l" says error etc...just means nothing is there is all...

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dpkg -l | grep '^rc' | awk '{print $2}' | sudo xargs dpkg --purge

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 dpkg -l | grep '^rc' | awk '{print $2}' | xargs sudo apt-get purge

then reboot and then see if you can finally get the latest kernel to take to your system.

[WharfRat]

What about dpkg -S /boot

[Flemur]

I'm sorry. It wasn't installed from software manager. I think.
it is from this ppa

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ppa:danielrichter2007/grub-customizer

I wonder if grub-customizer changed your default boot OS (or kernel) in the /etc/default/grub file - ?

[thx-1138]

...assuming GC is the culprit, it does way more than modify the contents of /etc/default/grub...

[UnwantedArun]

GRUB_DISTRIBUTOR="`lsb_release -i -s 2> /dev/null || echo Debian`"

what is this line ?

and this code

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### BEGIN /etc/grub.d/40_custom_proxy ###
menuentry "Linux Mint" --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-a632623b-d5fe-4a70-999b-1eb856fa3104' {
	recordfail
	load_video
	gfxmode $linux_gfx_mode
	insmod gzio
	if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
	insmod part_gpt
	insmod ext2
	set root='hd0,gpt7'
	if [ x$feature_platform_search_hint = xy ]; then
	  search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt7 --hint-efi=hd0,gpt7 --hint-baremetal=ahci0,gpt7  a632623b-d5fe-4a70-999b-1eb856fa3104
	else
	  search --no-floppy --fs-uuid --set=root a632623b-d5fe-4a70-999b-1eb856fa3104
	fi
	        linux	/boot/vmlinuz-4.15.0-33-generic root=UUID=a632623b-d5fe-4a70-999b-1eb856fa3104 ro  quiet splash pcie_aspm=off $vt_handoff
	initrd	/boot/initrd.img-4.15.0-33-generic
}
### END /etc/grub.d/40_custom_proxy ###

[WharfRat]

What is the content of cat /etc/grub.d/40_custom

[UnwantedArun]

What is the content of cat /etc/grub.d/40_custom

cat /etc/grub.d/40_custom
cat: /etc/grub.d/40_custom: No such file or directory

[WharfRat]

What's in that folder ls -lh /etc/grub.d

[Flemur]

...assuming GC is the culprit, it does way more than modify the contents of /etc/default/grub...

I never use that stuff (I have a hand-made grub.cfg file) so don't know much about it, but I wonder if the solution is to purge/reinstall these packages:

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grub-common
grub2-common
grub-pc