Ubuntu is booting very slowly after dual boot with Kali

Question

When I was using only Ubuntu 15.10, the boot time was very fast, it was about 15-20 seconds.

Recently I installed Kali-Linux rolling edition along side Ubuntu 15.10.
Afterwards the boot time of Ubuntu has drastically increased (Kali boots fast enough).
It takes almost 3 to 4 minutes -> "Ubuntu ....." loading.

• My system partitions :

• My BOOT-CHART :

*for higher resolution click here

• Output of dmesg is given HERE

• Output of fstab is given HERE

• Out put of journalctl is given HERE

I noticed that there is a gap of 72 Sec between line 971 to 972 in dmesg file.

I don't know why ?

Please help me to solve this problem.

Answer 1

Boot from Ubuntu installation media.

Select Try Ubuntu without installing.

Step 1 : Reinstall the Ubuntu GRUB boot loader.

Open a terminal and execute :

sudo mount /dev/sda2 /mnt
sudo mount /dev/sda1 /mnt/boot/efi
for i in /dev /dev/pts /proc /sys /run; do sudo mount -B $i /mnt$i; done
sudo chroot /mnt
grub-install /dev/sda
update-grub  
exit

Step 2 : Correct the UUID entries in the fstab file.

Open another terminal and execute :

sudo blkid  

Open another terminal and execute :

sudo gedit /mnt/etc/fstab

Replace the UUID entries of sda1 | sda2 | sda3 | sda4

with those of the output given from the blkid command.

Close all terminals and reboot into Ubuntu operating system.

Answer 2

Re-install grub and update entire fstab is more then necessary! if you wand the ubuntu splash-screen in grub instead kali splash-screen, yes you can reinstall grub.

kali(debian) installer, when installed belong another distro, do not take care about there have an existing swap partition so the installer format it again; once the swap partition has been formatted the UUID has change!

The only necessary is up to date the UUID of swap partition in the fstab and in "/etc/initramfs-tools/conf.d/resume" and regenerate the initramfs to let hibernation work again.