After updating to the latest LTS version (18.04) I am receiving the following error while booting my old PC:
---[ end Kernel panic - not syncing: IO-APIC + timer doesn't work! Boot with apic = debug and send a report. Then try booting with the 'noapic' option. [ 0.012000]
I can only run Linux by pressing reset and selecting "Advanced options for Ubuntu --> Ubuntu, with Linux 4.4.0-138-generic".
Any suggestions on what is going on?