Removing Linux Mint from dualboot

[sports fan Matt]

The 128 GB volume is Mint, which I'd like to allocate to Ubuntu

[Dennis N]

As I see it, you 256 G disk is this:

part 1 - a small bios boot partition - unused by UEFI systems. Is Mint a BIOS install? Since if UEFI, part 2 and 3 would switch places.
part 2 - 128 G Mint
part 3 - an EFI system partition (needed by UEFI)
part 4 - 127 G Ubuntu
no free space

With Ubuntu on part 4, it's bounded by the EFI system partition and the end of the disk so you can't enlarge Ubuntu's root partition. You have to either follow the suggestion for creating a data partition on part 2 given in post #2; or start over and install Ubuntu with the erase and install option and get the maximum space for Ubuntu.

[sports fan Matt]

So this morning, I wiped the system except when I chose Ubuntu to use the whole entire disk, it says it's installed but no such luck. It kept restarting and "acting " like the Ubuntu install was present. So I have LM for now, but I have to ask, it is possible the ISO got corrupted in Ventoy?

The strange thing is with Mint being on the disk, it boots immediately. can' run Ubuntu with Mint, just not standalone.

Matt

[oldfred]

Instead of screen shots which I cannot see with my old eyes use terminal & post in code tags to preserve formatting.
https://ubuntuforums.org/showthread....8#post12776168

These show details.
sudo parted -l
lsblk -f

[sports fan Matt]

Model: General USB Flash Disk (scsi)
Disk /dev/sdb: 61.9GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number Start End Size Type File system Flags
1 1049kB 61.8GB 61.8GB primary boot
2 61.8GB 61.9GB 33.6MB primary fat16 esp


Model: LENSE20256GMSP34MEAT2TA (nvme)
Disk /dev/nvme0n1: 256GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
1 1049kB 2097kB 1049kB bios_grub
2 2097kB 540MB 538MB fat32 EFI System Partition boot, esp
3 540MB 256GB 256GB ext4

[sports fan Matt]

NAME FSTYPE FSVER LABEL UUID FSAVAIL FSUSE% MOUNTPOINTS
sda
sdb
├─sdb1
│ exfat 1.0 Ventoy 4E21-0000 51.9G 10% /media/mattyice/Ventoy
└─sdb2
vfat FAT16 VTOYEFI 223C-F3F8
nvme0n1

├─nvme0n1p1
│
├─nvme0n1p2
│ vfat FAT32 26F3-E861 505.8M 1% /boot/efi
└─nvme0n1p3
ext4 1.0 ada6ed06-41cb-4641-9a28-b84348891767 205.9G 7% /

[sports fan Matt]

Now I reinstalled mint this morning to just get something working, but if I erase and use "whole disk, it restarts in a loop" Could Ventoy be the issue?

[oldfred]

You show both a bios_grub partition for BIOS boot and an ESP - efi system partition for UEFI boot.
You have to always be consistent and generally if UEFI system, better to install in UEFI boot mode to gpt partitioned drives.

But default boot setting in UEFI settings must match how you install.
And how you boot install media is separate and must match how you want to boot.
So make sure UEFI/BIOS is set for UEFI boot. And always boot USB flash drive in UEFI boot mode.

If you have a grub installed in BIOS mode & system tried to boot that when last install was UEFI, it will not boot, or boot to grub>.

If you have install and want to know details you can always run Boot-Repair's Summary Report and post link.

Please copy & paste the pastebin link to the BootInfo summary report ( do not post report), do not run the auto fix till reviewed. Use often updated ppa version with your USB installer or any working install over somewhat older ISO.
https://help.ubuntu.com/community/Boot-Repair &
https://sourceforge.net/p/boot-repair/home/Home/

[sports fan Matt]

https://paste.ubuntu.com/p/BkXc5TrrkB/

Hope that works

[sports fan Matt]

I have reinstalled pretty close to where I was. Thank you all for the advice. I’m going to see which operating system I want to keep and then go from there in a week.