Well, I'm only came here again firstly to say thanks to Michael and Thomas for 
taking into account this problem. Specially, knowing that this bug probably is 
quite exceptional and affects at only few cases. Today I was trying on some old 
computers on my job and it booted fairly well on all of this so, I had bad luck 
with this issue.
Secondly, I don't know what is the best approach for fixing this problem. If it 
would be easy to insert a message when the boot process gets stuck or what. I 
think it is normal that, if the USB does not reach the desktop environment 
after more than 5 or 6 minutes and if you listen the cpu fan working at full 
speed, it is normal to think that the usb it's not going to boot. 
I was timing how long it takes to reach plymouth and the full desktop 
environment with a Lubuntu daily build iso and this was the results (the start 
point was grub in all cases):
With the iso without any change:
- Plymouth --> 7 minutes
- Desktop environment --> 7 minutes 50 seconds
Marking the first partition as bootable legacy BIOS:
- Plymouth --> 54 seconds.
- Desktop environment --> 1 minute 45 seconds
Without marking any partition as bootable but changing the partition table from 
GPT to MBR:
- Plymouth --> 25 seconds.
- Desktop environment --> 1 minute 20 seconds.
With this results is clear that the last is the best so, a naive question for 
my part is: would it be too inconvenient to release 2 isos: a main iso for most 
computers and a legacy iso with an MBR partition table for use if somebody has 
problems with the main iso?
And finaly, other possible solution might be to include on the release notes or 
somewhere more suitable that, on some systems, this problem could be present 
and the possible workarounds.
And nothing more on my part. It's time for the people on charge of this decide 
what is better. If something more is needed from me let me know.
Thanks and have a nice day.

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https://bugs.launchpad.net/bugs/1922342

Title:
  HIrsute live session takes ages to boot on BIOS systems

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