I hope this is the correct use of this forum - I am a long term Lubuntu user, and attempting to move to 20.04.

I am seeking the LTS version of Lubuntu, 20.04.1, with kernel 5.4, which is supported for 5 years.

I recently downloaded the latest Lubuntu Desktop from here: https://lubuntu.me/downloads/ which provides the latest Point Release, which is Lubuntu 20.04.2. It came with kernel 5.8, which is only supported for 9 months. . The above web page also offered a link to download previous versions: https://cdimage.ubuntu.com/lubuntu/releases/

Unfortunately, that second link only serves up Lubuntu 20.04.2, no matter what directory you choose. I went to here for example: https://cdimage.ubuntu.com/lubuntu/releases/20.04.1/release/ but it too only offers 20.04.2.

I am wondering if anyone can assist. Is it still possible to obtain an ISO for Lubuntu Desktop 20.04.1? Or should I just install 20.04.2 and manually downgrade the kernel (I suspect that might not be safe). . Appreciate assistance if anyone knows. Perhaps https://cdimage.ubuntu.com/lubuntu/releases/20.04.1/release/ is mistakenly offering the wrong version?

Thanks very much.

Edit

The file you want: lubuntu-20.04.1-desktop-amd64.iso

As a Lubuntu member, I decided to provide a copy of the Lubuntu 20.04.1 LTS iso file, that I know is good, and that I can manage myself.

I downloaded a copy of lubuntu-20.04.1-desktop-amd64.iso when it was recently released (and checked it), so I know that it is good. I uploaded a copy of that iso file plus two checksum files so that you can check your copy after downloading.

See this link.

There is also a file at the Wayback Machine as shown in the answer by muru.

The following paragraphs are kept in the answer as examples of possible work-arounds [for other cases], when you cannot find the file that you want.

End of edit

Lubuntu 20.04 LTS demo example

You can find a demo example made by me, that might be useful for you.

See a description and discussion at this link

and a link to a compressed image (from post #4 in that discussion).

This will bring Lubuntu 20.04 LTS (uploaded May 1 2020, before the release of 20.04.1 LTS), it has the correct kernel series for you, but after installing, there will be a lot of updates & upgrades.

Warning: The general Ubuntu program packages will be supported for 5 years, but the specific Lubuntu packages will be supported for only 3 years. Please notice that all community flavours have only 3 years support of the LTS releases.

Standard Ubuntu 20.04.1 LTS

Another work-around is to get standard Ubuntu 20.04.1 LTS from

http://old-releases.ubuntu.com/releases/20.04/

and add Lubuntu

sudo apt install lubuntu-desktop

There will be 'some extra files' but it might work well, and today drive space is seldom a bottleneck.

Ubuntu 20.04 mini.iso

Yet another alternative is to start from the Ubuntu 20.04 mini.iso. You can find it (dated April 21 2020) via this link and the md5sum is 'upstairs' in the parent directory.

The installer in mini.iso is the old text mode debian installer. You can install lubuntu-desktop during or after the installation.

Please notice that mini.iso works only in BIOS mode (alias CSM alias legacy mode). It does not boot in UEFI mode.

Downgrading from 20.04.2 to 20.04.1

The following downgrading method was verified by ajgreeny at this

Ubuntu Forums post

It is maybe the easiest method, at least if you have the Lubuntu 20.04.2 iso file already :-)

• Install Lubuntu 20.04.2 from the available iso file

• Boot into the installed Lubuntu system

• Remove the hwe kernel package

  sudo apt remove linux-generic-hwe-20.04
  

• Install the plain kernel package

  sudo apt install linux-generic
  

  It will immediately pull in the most recent 5.4.0-74 kernel plus dependencies, eg the header packages.

• Reboot and remove the unwanted kernel package

  sudo apt remove linux-image-5.8.0-55-generic
  

  along with any other versions of the 5.8 series.

• Finally autoremove the now unused packages and maybe also make things up to date and then clean by

  sudo apt update
  sudo apt full-upgrade
  
  sudo apt autoremove --purge
  
  sudo apt autoclean
  sudo apt clean
  

The Wayback Machine has the original ISO list page from Lubuntu 20.04.1 archived: https://web.archive.org/web/20210128060849/http://cdimage.ubuntu.com/lubuntu/releases/20.04.1/release/

In particular, the ISO is available at https://web.archive.org/web/20210128060849/http://cdimage.ubuntu.com/lubuntu/releases/20.04.1/release/lubuntu-20.04.1-desktop-amd64.iso (caveat emptor: I haven't downloaded it or verified it.

I'll recommend reading sudodus' answer (if you look he's a Lubuntu member)

For years I downloaded all and store them on my local server (Canonical commonly don't keep flavors beyond the latest ISO), but when I've needed an ISO that I don't have locally, I've almost always found it on an official mirror (see https://launchpad.net/ubuntu/+cdmirrors) having had the best luck with French & German Ubuntu LoCo (forum) sites (though I always use another site to get the checksum to validate it if I don't already have it locally, and it's not quick as I don't read either French or German).

Sorry I'm not on my normal PC so I don't have access to my history where I'd likely be able to provide a URL that maybe helpful, but I fear it was a 18.04.3 or old bionic ISO so won't be what you're after anyway

Lubuntu 20.04.2 and switching to GA stack

I will add that I've tested starting with a Lubuntu 20.04.2 ISO, installing it, then adding the GA kernel stack to it. You can follow the instructions found https://wiki.ubuntu.com/Kernel/LTSEnablementStack in the DESKTOP section and they work...

Removing the HWE stack is optional, so I'd not do it until you know the GA stack is perfectly functional (keeping it will just cost more packages installed; ie. disk space used, more packages to update; ie. bandwidth for updates, ie. minimal effects) but the wiki makes that clear as it suggests only removing packages "if everything is good".

(I may not have tested all commands exactly as listed in the Ubuntu wiki, eg. Lubuntu media does not include OEM support so I'd likely have skipped those packages, I documented it somewhere (likely on Lubuntu's discourse too), but sorry I'm not looking for it as I'm not on my PC and may not be there in a few days).