Lubuntu 26.04 install DVD

Support and Help
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1

Tried to boot from this, all seemed to be going well, I reached the stage where I saw:

Finished plymouth-quit.service

I then got a black screen with a mouse pointer which eventually changed to a blue gradient screen

Nothing much happened after that :frowning:

2

Did you download the Lubuntu iso from the official site?

https://lubuntu.me/

Did you verify the download was not corrupted? What software did you use to write the iso to the DVD? Post some information on your hardware? Have you installed Lubuntu or any Linux on this computer before? Do you have another computer you can boot the DVD from as a test to eliminate it as the problem.

3

I downloaded it from the official site, and used ImgBurn to burn the ISO.

I have successfully booted 24.04 DVD on this computer previously I am certain.

Dell Precision 7750 Xeon W-10885M, 128GB RAM

David

4

When the live environment starts up, have you tried Safe Graphics mode?

Any difference in the end result?

5

I was never offered an option to do anything like select Safe Graphics mode.

I will try to boot the DVD on my current Linux 24.04 system.

6

That booted a little differently - Text Lubuntu 26.04 and four dots underneath rather than a spinning Lubuntu logo, but apart from that the main difference was that I was offered the Try Lubuntu and Install Lubuntu choices against that blue gradient background which I wasn’t on my laptop (which has an nVidia Quadro RTX 5000).

7

I just fired up Lubuntu 26.04 in a virtual machine.

Below Try or Install Lubuntu there should be a line called Lubuntu (Safe Graphics).

You are not seeing this?

If not, then when you see Try or Install press e on the keyboard to edit the boot line.

Use the keyboard arrows and navigate to the line that starts with linux

After quiet splash add nomodeset so it looks like this quiet splash nomodeset

Then Ctrl+X or F10 to continue booting.

Does this get you further along the way?

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8

My point is I never see the Try or Install stuff - I only see the background gradient

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9

Did you verify the ISO you downloaded? A bad ISO will give a bad install experience

10

As it works fine on the other system I suspect something video related.

But, no, I didn’t - how to verify the check sum on a Windows system?

David

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11

https://ubuntu.com/tutorials/how-to-verify-ubuntu#1-overview

12

Checksums match:
```
C:\Users\amonra\Downloads\Ubuntu>certutil -hashfile lubuntu-26.04-desktop-amd64.iso SHA256
SHA256 hash of lubuntu-26.04-desktop-amd64.iso:
a9eef9e75c139caa428d11799f681e2d29e6ba7e22aa045d9a64599d45cd12ff
CertUtil: -hashfile command completed successfully.

C:\Users\amonra\Downloads\Ubuntu>
```

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13

Still no response about this not working other than to make sure the image is good (which I have done).
What can I do to assist in resolving the problem.

14

Some suggestions:-

  • Remove all peripheral disks & devices - only have the target disk available
  • Use a different utility to burn the DVD
  • Use a different USB port (not via an external hub)
  • Do not connect to the internet
  • The DVD Disk may be faulty
  • The target disk is damaged

Is there a particular reason to use a DVD rather than a USB?

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15
  1. DVD verifies perfectly. I’ve never know ImgBurn to burn a bad disk.
  2. System is a laptop, can’t remove anything.
  3. No change plugging DVD drive direct into USB port on lappie.

This stinks of a video driver problem.

1 Like
16

Graphic driver problem

I agree, that you have a video driver problem, which is rather common with nvidia graphics. Usually you can at least reach to the grub menu, where you can add the boot option nomodeset or simply select ‘Safe graphics’.

via other Ubuntu family desktop systems

To work around the problem that you never see the grub menu, you might consider downloading and installing Xubuntu which (I think) starts with a more basic text mode (into the grub menu), and when you have installed it you can run

sudo apt install lubuntu-desktop

and you will get almost the same Lubuntu as you would get from the Lubuntu iso file, but in this case alongside Xubuntu.

When installed, you can test various proprietary nvidia drivers until you find one, that works without nomodeset.

You could even try standard Ubuntu Desktop, which uses Wayland for the desktop, and it has a rather good built-in driver for nvidia (the nouveau driver), and into that system install lubuntu-desktop. But I think the Ubuntu Desktop 26.04 LTS iso file is too big for a DVD, so here you must clone from the ISO file to a USB drive with at least 8 GB.

Unfortunately, this workaround will add a lot of extra files, that might be hard to get rid of, but maybe there is enough space in your SSD for that.

via Ubuntu Server

Another way, that does not create too many extra files is to start by installing Ubuntu Server, that works in text mode. It may be hard to get into graphics mode unless you add nomodeset into the grub.cfg file before you install lubuntu-desktop into it.

Also here, when installed, you can test various proprietary nvidia drivers until you find one, that works without nomodeset.

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17

You should verify the integrity of the actual DVD from the boot menu of the live session — should say something like “Check disc for defects”. I’ve seen all kinds of funky stuff happening with faulty media/devices; you can verify the image all you like, what really counts is the readout of the DVD contents when booting from it. I’ve also seen Ubuntu staff saying something to the effect that a major portion of installation bug reports is due to faulty install media/devices.

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18

Unfortunately, your recipe doesn’t help me with the problem – I was trying to use the DVD as a “Live DVD” for booting Lubuntu to do some repair work on a system, not to install Lubuntu.

19

I think it would have been very helpful if you had told us this from the start.

To do repairs from the live environment does not require the same flavour. Any recent version of Ubuntu or one of the flavours would be sufficient if you intend doing something like a chroot.

Please tell us exactly what you are wanting to do.

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20

In this case, try Xubuntu, which might show the grub menu, and there you can add the boot option nomodeset.

Or try some ‘rescue system’ for example SystemRescue

https://www.system-rescue.org/

which boots in text mode, and you can select various alternatives at the grub menu.

When booting according to the default option, you can switch to graphics mode with the command

startx

In your case you may want to use the boot option nomodeset, if you want to get into graphics mode.

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