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Bobby

Member

Registered: 2026-07-28

Posts: 12  

Re: [SOLVED] Installation Problem after selecting Language and Country

There is nothing in /lib/debian-installer-startup.d/S21ventoy-loop. The folder itself exists, though. Edit: Sorry, my bad, thought it was a folder. The file contents are:

sleep 1
DEV=$(blkid -L Ventoy)
mount -t exfat $DEV /mnt
modprobe loop
losesetup -f /mnt/devuan_excalibur_6.1.1_amd64_netinstall.iso

Is it possible that the problem is that the boot order in my BIOS doesn't start from USB? I doubt it, but I'm not too familiar with it to know either way.

Last edited by Bobby (2026-08-02 15:31:29)

rolfie

Member

Registered: 2017-11-25

Posts: 1,485  

Re: [SOLVED] Installation Problem after selecting Language and Country

Is it possible that the problem is that the boot order in my BIOS doesn't start from USB? I doubt it, but I'm not too familiar with it to know either way.

Under normal circumstances: no. You have a brandnew efi-only system. To boot from any device connected to your main board you go into the bios and directly select the device or you can use boot-override. This is a nice efi feature: you press a certain key during the boot process, and get the boot menu as result and can select the device to boot from. This key you need to press depends on the mainboard/efi bios manufacturer. On my ASUS mainboard I have to use F8. When I am not mistaken you have a MSI mainboard. Please read the manual, it should be documented in there.

rbit

Administrator

Registered: 2018-06-12

Posts: 138  

Re: [SOLVED] Installation Problem after selecting Language and Country

OK, your S21ventoy-loop file looks good.

What does this return?

losetup -a

If it returns nothing, try this

sh /lib/debian-installer-startup.d/S21ventoy-loop ; losetup -a

If there's this line: /dev/loop0: 0 /mnt/devuan_excalibur_6.1.1_amd64_netinstall.iso - then try this:

mkdir -p /cdrom ; mount -t iso9660 /dev/loop0 /cdrom

If it mounts correctly, then see if installation will continue.
If there are any errors/info displayed, please report back.

kapqa

Member

Registered: 2019-01-02

Posts: 736  

Re: [SOLVED] Installation Problem after selecting Language and Country

if you still have doubts, you can press "del" for enter bIOS , and then "F5" or similar for default settings, press "F10" for savings setting, that should settle it for you.

Good luck.

Edit: if you really want to use ventoy, then there is option "partition style" in VentoyMenu > it should be set to "GPT" for coexistance with Win11 i suppose; have checked this just yet, on linux there exist such option. otherwise, with standard-setting "MBR" you run into conflict, most probably. but windows-ventoy might handle it differently. just a warning.

Edit2: just tested this with excalibur.netinstall-iso. with ventoy:

when using standard settings (mbr) > it would fail exactly at the point you described;
when formatting with partition style (gpt) > the netinstall would process, you could proceed.

please disregard the upper portion with "default settings" then; you should set most probably BIOS as described earlier, with SecureBoot (ON or OFF) and if (ON) with "Custom" setting; or the like.

Last edited by kapqa (Today 02:04:32)

Bobby

Member

Registered: 2026-07-28

Posts: 12  

Re: [SOLVED] Installation Problem after selecting Language and Country

`losetup -a` gave nothing

`sh /lib/debian-installer-startup.d/S21ventoy-loop ; losetup -a` gave `/dev/loop0: 0 /mnt/devuan_excalibur_6.1.1_amd64_netinstall.iso` as mentioned.

`mkdir -p /cdrom ; mount -t iso9660 /dev/loop0 /cdrom` gave nothing

Then, continuing installing froze everything (though this happened on the attempt immediately before as well, so likely not because of the above)

I selected GPT when creating my USB with Ventoy

Last edited by Bobby (2026-08-02 23:08:59)

rbit

Administrator

Registered: 2018-06-12

Posts: 138  

Re: [SOLVED] Installation Problem after selecting Language and Country

OK.  For now it seems like you need to manually run

sh /lib/debian-installer-startup.d/S21ventoy-loop

to get your iso loop device set up properly.
Could you run the "expert install" and find out on which step does it freeze?  Are you able to change to tty4 at that point and read any debugging text?

kapqa

Member

Registered: 2019-01-02

Posts: 736  

Re: [SOLVED] Installation Problem after selecting Language and Country

well, must have gooten it all wrong, sorry for the previous post;

tried again today:
with ventoy-linux (./VentoyGUI.x86_64) the netinstall went through with both MBR and GPT
with ventoy-windows (Ventoy2Disk) the netinstall went through with MBR and NOT with GPT!

if i used GPT (via Ventoy2Disk), receive the same error you posted earliert

"Incorrect installation media detected"
"The detected media cannot be used for installation."

so i suggest you try again format with Ventoy and let use partition Style "MBR" which is standard setting for Ventoy.
that should work.

https://ibb.co/CKZ7HcsG

Bobby

Member

Registered: 2026-07-28

Posts: 12  

Re: [SOLVED] Installation Problem after selecting Language and Country

Oh, it seems to have progressed now! I reinstalled Ventoy onto my USB by disabling the Secure Boot option (don't know if this did it, since I disabled Secure Boot in the BIOS, but maybe it did) then recopied over the iso. After running it with Expert Install, it gave the same "no installation media" error, but then, after I ran "sh /lib/debian-installer-startup.d/S21ventoy-loop", it finally detected it.

I don't know if this was because of what I did to Ventoy/recopy, or if it would have worked before with just the command, and I just gave up after it froze too soon, but it finally worked. I'll continue with the installation and see if everything works. I'll report back if I reach another error or if it finishes with no more problems.

Edit: it then froze when clicked Network Config option. It seems like the freezing was a separate issue from the media detection issue (or maybe it's just that error = freeze at times or something like that)

Edit 2: Yeah, it probably is a separate problem. Doing it again, I easily got past detecting network. Maybe the freezing is just a hardware issue, or maybe an idling issue?

Last edited by Bobby (Yesterday 22:13:02)

Bobby

Member

Registered: 2026-07-28

Posts: 12  

Re: [SOLVED] Installation Problem after selecting Language and Country

Installation was successful! It seems like it was just that mounting issue and the occasional freeze for some reason.

I do seem to have some issues getting and upgrading packages, but I assume that's more of a networking issue I can figure out (I don't have ethernet, so I used my phone's internet during the installing).

Thanks for all the help, everyone!