Boot Problems LMDE4 <SOLVED>

[undern]

I have been using LMDE4 64 bit for some time. It has stopped booting (I am not sure what happened). I get either the grub prompt or a message that says it is a non-system disk. I have tried booting 1) normally (UEFI) and 2) selecting the SSD from the boot options when I start up. I booted the machine using a live USB stick and ran the boot-repair GUI tool (which is on the live USB menu). It still does not boot.
I have read the Mint documentation and searched the forums but haven't found anything that seems on point. I am willing to have someone point either to the a relevant forum post or to somewhere else in the documentation for things I have missed. Or just tell me the quickest way to go. If it helps, I have some daily and boot Timeshift files on a separate drive.

I have attached a text file with the system info. I also have another text file that was produced by the boot-repair tool. I did not attach it (it's too large). If someone thinks it will be useful I will try again.

BTW, I am a relative newcomer to Linux and Mint, so maybe I should have posted this to the Newbie forum.

[Moonstone Man]

Or just tell me the quickest way to go.

Are we there yet, dad? Are we there yet, mum?

The output from inxi shows this:

Code: Select all

Drives:    Local Storage: total: 938.51 GiB used: 78.76 GiB (8.4%) 
           ID-1: /dev/sda vendor: Patriot model: Burst size: 894.25 GiB speed: 6.0 Gb/s 
           serial: <filter> temp: 33 C 
           ID-2: /dev/sdg type: USB vendor: Lexar model: USB Flash Drive size: 29.81 GiB 
           serial: <filter> 
           ID-3: /dev/sdh type: USB vendor: Patriot model: Patriot Memory size: 14.44 GiB 
           serial: <filter> 

What one of those is your boot device? I could assume /dev/sda but a lot people install Linux Mint to flash devices. Also, can you post the output of both lsblk and lsblk -if, please? Finally, can you verify that your default boot is always EFI?

When you post the output from a terminal, enclose it in code tags [code]output.here[/code]. You'll see the code tags icon </> when you reply. When I have that information I'll see what I can do help you. You might need to widen your terminal to catch all the output of some of the commands.

[Moem]

I am a relative newcomer to Linux and Mint, so maybe I should have posted this to the Newbie forum.

That's not a big deal, but you should in either case have posted it in the LMDE area, not the Main Edition area.
Moved now, carry on

[undern]

The seat belt is on, Dad.

The desired outcome is to boot from sda. But since it doesn't work, I'm booting from a flash drive (with the installation files downloaded from the Mint site). BTW, I put the flash in a different USB slot when I booted this time. It's sdb here.

EFI should be the default.

Here is the code:

mint@mint:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 1.7G 1 loop /lib/live/mount/rootfs/filesystem.squashfs
sda 8:0 0 894.3G 0 disk
└─sda1 8:1 0 894.3G 0 part
├─lvmlmde-root
│ 254:0 0 878.7G 0 lvm
└─lvmlmde-swap
254:1 0 14.6G 0 lvm
sdb 8:16 1 14.5G 0 disk
├─sdb1 8:17 1 1.9G 0 part /lib/live/mount/medium
└─sdb2 8:18 1 2.9M 0 part
sdc 8:32 1 29.8G 0 disk /media/mint/Data
sr0 11:0 1 1024M 0 rom

mint@mint:~$ lsblk -if
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
loop0 squashfs 0 100% /lib/live/mount/rootfs/filesystem.squashfs
sda
`-sda1 LVM2_member OweaXJ-rckH-XezR-OLnh-QC8V-3x6Y-enVUw6
|-lvmlmde-root ext4 9a359224-1d3b-4adc-b475-0ae204249a5c
`-lvmlmde-swap swap 0f3a6542-27c9-4ad8-87e2-4e121975f2c8
sdb iso9660 LMDE 4 Cinnamon 64-bit 2020-03-13-12-30-44-00
|-sdb1 iso9660 LMDE 4 Cinnamon 64-bit 2020-03-13-12-30-44-00 0 100% /lib/live/mount/medium
`-sdb2 vfat LMDE 4 Cinnamon 64-bit DEB0-0001
sdc vfat Data A367-09CB 28.6G 4% /media/mint/Data
sr0
mint@mint:~$




Also, sdc is a flash drive I inserted to copy the code.

[linux-rox]

About all I know about LVM is how to spell it, but I notice you seem not to have an EFI partition.

[undern]

Solved via youtube. https://www.youtube.com/watch?v=QHe3-hF-Rdk