Public bug reported:

I'm using Xubuntu in an old system, I'm concerned because other users
looking for a light OS for their old PC wouldn't be able to install or
boot the 18.04 version and above.

With kernel 4.4.0 the system boots without problem (xubuntu 16.04),
after upgrading to kernel 4.15 the system doesn't boot anymore (18.04).
This issue was present when testing kernel 4.13 too.

The install crashes with an error: BIOS bug:8254 timer not connected to
io-apic error on.

Adding any of these commands to the boot allows the system to load
properly:

-acpi=off
-pci=noacpi
-acpi=noirq

I attach the info related.

Ubuntu 4.15.0-32.35-generic 4.15.18

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Attachment added: "lspci-vnvn.log"
   
https://bugs.launchpad.net/bugs/1788387/+attachment/5179107/+files/lspci-vnvn.log

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https://bugs.launchpad.net/bugs/1788387

Title:
  After upgrading from 4.4.0 to 4.15.0 system doesn't boot - ACPI issue

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I'm using Xubuntu in an old system, I'm concerned because other users
  looking for a light OS for their old PC wouldn't be able to install or
  boot the 18.04 version and above.

  With kernel 4.4.0 the system boots without problem (xubuntu 16.04),
  after upgrading to kernel 4.15 the system doesn't boot anymore
  (18.04). This issue was present when testing kernel 4.13 too.

  The install crashes with an error: BIOS bug:8254 timer not connected
  to io-apic error on.

  Adding any of these commands to the boot allows the system to load
  properly:

  -acpi=off
  -pci=noacpi
  -acpi=noirq

  I attach the info related.

  Ubuntu 4.15.0-32.35-generic 4.15.18

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