21.1 install alongside windows 10

Shemp · Post by **Shemp** » Wed Mar 29, 2023 12:17 pm

Hi all,

I'm trying to install 21.1 alongside an existing windows 10, and replacing 19.3. I've had this dual boot for almost 5 years of 19's various flavors. The installer used to recognize windows, and you could just leave it be and it would install Linux Mint easy alongside. The new installer will let you erase whole disk, reinstall 19.3, or dual boot 2 Linux Mints. Or, "something else". I can't be the only person with this problem. Can't I just install 21.1 where 19.3 is now? Ive searched the forums and could not find help. If there is a thread you know of, please let me know. Thanks!

diabolicbg · Post by **diabolicbg** » Wed Mar 29, 2023 1:39 pm

Yes, you can. Select "something else" and set the installer to where LM19 used to be. If the installer suggests, format the partition where LM19 was, but first of all backup your home folder if you have valuable files. After installation, open a terminal and enter the command: sudo update-grub - so LM will find Windows 10 and show you the OS selection menu.

Shemp · Post by **Shemp** » Wed Mar 29, 2023 1:45 pm

That's great! Thanks. How do I make sure I pick the right partition in "something else"?

diabolicbg · Post by **diabolicbg** » Wed Mar 29, 2023 1:51 pm

Shemp wrote: ⤴Wed Mar 29, 2023 1:45 pm That's great! Thanks. How do I make sure I pick the right partition in "something else"?

It should be easy to find your way around - the Windows partition is NTFS and the LM partition is EXT. You can preview them in the live session via Gparted is even format the LM19 partition to EXT4. That way you will be sure there is no interference of old files in the new installation.

To be able to format, you will need to give the disk an "unmount" beforehand.

Shemp · Post by **Shemp** » Wed Mar 29, 2023 2:26 pm

On installing, I got Fatal Error : unable to install grub... I really don't know what I'm doing wrong. I just pushed the button to install 21.1... Straight install. Any suggestions? I no longer have 19.3, it's disappeared.

diabolicbg · Post by **diabolicbg** » Thu Mar 30, 2023 2:39 am

Try in a live session to reinstall grub. You need to assign it a location on the main disk - sda, not sda1...

Shemp · Post by **Shemp** » Thu Mar 30, 2023 2:41 am

Thank you!

diabolicbg · Post by **diabolicbg** » Thu Mar 30, 2023 2:46 am

Let's hope it works out. I'm not sure exactly what happened.
You can try also Boot repair in live session.

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