[Bug 1886769] Re: [ 0.000000] Initramfs unpacking failed: Decoding failed

Got this bug too.

Steps to reproduce:

1. Download ubuntu-20.04.1-desktop-amd64.iso and verify.
2. Install onto USB stick using Startup Disk Creator.
3. Boot machine from USB stick.

Expected results:
- Machine boots into live Ubuntu.

Actual results:
1. BIOS stuff, as per usual.
2. Grub 2.04 screen, boots "Ubuntu" option by default after a few seconds.
3. Machine hangs with message "[0.XXXXXX] Initramfs unpacking failed: Decoding failed" (where XXXXXX is a different number each time).
This message is always followed by 5 lines of really tiny text, completely unreadable on my 4k screen.
Machine now appears to be dead, except that:
- On one occasion, hitting Enter caused screen to fill with more unreadable tiny text.
- On another occasion, after a minute of me doing nothing, machine played a short chip tune!

Machine config:
- Lenovo Thinkpad X1 Extreme, Gen 2, one year old.
- UEFI BIOS Version: N2oet47w (1.34), 2020-08-06.
- Firmware is current (as per Lenovo Vantage check, done several days ago).
- My BIOS security settings are maxxed out.

Notes:
- I tried with Secure Boot enabled and disabled; made no difference.
- Machine boots fine into a very recent Ubuntu 20.10 beta, using same laptop and USB stick. (Unfortunately, the ROS software won't work on 20.10 yet.)
- Just repeating: all was fine with Ubuntu 20.10 beta. But fails with 20.04.1.

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https://bugs.launchpad.net/bugs/1886769

Title:
[ 0.000000] Initramfs unpacking failed: Decoding failed

Status in linux package in Ubuntu:
Confirmed

Bug description:
Steps to reproduce:
1. Download MATE Groovy daily (sha256sum = 7d2fdad36b8fcf0409aa0a484755e5fc5ef3798fd256eeebbde905a71ad474b7 )
2. Insert ISO into VirtualBox with EFI enabled
3. Boot VM

Expected results:
* VM boots normally

Actual results:
* VM hangs during early boot with message

      [ 0.000000] Initramfs unpacking failed: Decoding failed

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