Two instances of grub

Question

I tried installing Ubuntu on my laptop several times and finally succeeded(dual boot) I need to select ubuntu from boot menu in order to open grub and start ubuntu So that is not my problem My actual problem is:

1. i see two ubuntu written on the menu
2. Is this two instances of grub
3. My ubuntu also runs very slow Is it due to this two instances of grub

How can I remove one of them ?

My Laptop is Hp pavilion g6 2320tx Intel core i5 4GB RAM 1 TB hdd Graphic processor amd mobility radeon 7670M (i have disabled the radeon graphics in linux just to check whether this is causing the laptop getting slow but no change detect , still slow , the radeon graphics is still disabled)

EDIT 1 The result of

sudo update-grub

The result of

sudo efibootmgr -v

Answer 1

Your screen shots aren't showing up for me. In general, multiple entries in the EFI's boot menu should not be a problem. In fact, it's common to see two such entries, one pointing to grubx64.efi and the other to shimx64.efi. If this is what you're seeing, it's perfectly normal. I wouldn't worry about this or attempt to "fix" it unless you think it's causing a real problem. I say this because mucking with these entries can cause much more serious problems, like a complete failure to boot; it's just not worth it to fix a minor cosmetic issue. That said....

I recommend you look at the BootOrder item in the efibootmgr -v output. Chances are it's set incorrectly, and setting it to boot one of the ubuntu entries (either one if you're not using Secure Boot, or the one pointing to shimx64.efi if you are) will get the system booting directly into GRUB. You can do this via the -o option to efibootmgr, as in sudo efibootmgr -o 0002,0000,0003 to boot Boot0002 as a first priority, Boot0000 if that fails, and Boot0003 if neither of the preceding options works. You must check your actual efibootmgr -v output to figure out what order to use, of course. Alternatively, you could do this using EasyUEFI in Windows.

Multiple EFI boot manager entries should not cause speed problems in Ubuntu. I recommend you post a new question about that topic. Chances are you've got a runaway process, too little RAM, or some other problem that's completely unrelated to EFI or GRUB. Typing top in a window will show details that might be helpful, so posting a screen shot of that may be worthwhile -- but please be sure you post the screen shot correctly.

Answer 2

This is standard for ubuntu and for that matter most other linux distributions when the kernel is updated the package manager retains one previous version and removes the older ones. This is done for a reason, if there is some issue with the new kernel install it lets you boot the system with the previous known good kernel instead.

Of course there is no real reason to keep it after you are sure that the newer kernel boots correctly in your case you could use the following command to remove the older 4.4.0-21 kernel installation:

sudo apt-get remove linux-*-4.4.0-21

There is really no need to do this however unless you are in the situation where a few tens of megabytes of disk space is critical in which case honestly it's probably advisable to consider investing in a hardware upgrade since a few hundred megabytes is hardly any space and you would constantly be running into the need to remove things as the disk fills up every 5 minutes.