grub-install: error: cannot find EFI directory

Device Start End Sectors Size Type
/dev/sda1 2048 1050623 1048576 512M EFI System
/dev/sda2 1050624 837228543 836177920 398.7G Linux filesystem
/dev/sda3 1452748800 1465147391 12398592 5.9G Linux swap
/dev/sda4 837228544 1452748799 615520256 293.5G Microsoft basic data
Partition table entries are not in disk order.
Disk /dev/sdb: 14.6 GiB, 15636364800 bytes, 30539775 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00378159
Device Boot Start End Sectors Size Id Type
/dev/sdb1 * 2048 30539774 30537727 14.6G c W95 FAT32 (LBA)

I am kinda lost here. I am not very experienced with ubuntu and might need a little detailed solution. I installed Windows 10 after ubuntu 16.10 and when I try to reinstall grub2 and it gives me the following error: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?Please help!

2 Answers

Try this:

Boot the Ubuntu Live Usb-Dvd.

Open a terminal,

Press Ctrl+Alt+T

Run it:

sudo -i
mount /dev/sda2 /mnt
mount /dev/sda1 /mnt/boot/efi
grub-install --boot-directory=/mnt/boot --bootloader-id=ubuntu --target=x86_64-efi --efi-directory=/mnt/boot/efi
reboot

The root cause of your problem is Temporary failure resolving 'al.archive.ubuntu.com This means that when you attempted this process the server was temporarily unavilable. You have 2 options.

1) Try again

2) Choose a different mirror By Opening Software & Updates and selecting a different server in the Download from drop down menu. (Choosing Other will run a series of tests to determine which is the best server for you.)