[lubuntu] Missing Plymouth splash screen during bootup after kernel upgrade

Hi everybody

Been having the following issue: on a Virtualbox Lubuntu installation my Plymouth splash screen shows at boot time, however if I upgrade the kernel, next time I boot the splash screen is no longer invoked and I get this.
VirtualBox_Lubuntu 32-bit 18.04 ALT (DEV)_12_07_2019_10_26_54.png

I have performed several selective updates to try and isolate the problem: whenever it comes to upgrading the kernel the above happens, so I am assuming that, somewhere between kernel version 4.15.0-20-generic (the one I had at install time) and the latest I'm presented with (4.15.0-54) the issue occurs.

The splash screen is not missing, it is just not invoked at boot time. This is confirmed at shutdown time when the splash screen is shown as expected:

VirtualBox_Lubuntu 32-bit 18.04 ALT (DEV)_12_07_2019_10_44_10.png

After kernel upgrade, plymouth-debug.log shows some inconsistencies such as this

I have attached both plymouth-debug.log files (before and after kernel upgrade) for comparison.



Has anyone come across this issue before?


System details:
VirtualBox 5.2.30
Lubuntu 32-bit 18.04 alternate version (lubuntu-18.04-alternate-i386.iso)
working kernel version: 4.15.0-20-generic


Thanks

Attached Images

• VirtualBox_Lubuntu 32-bit 18.04 ALT (DEV)_12_07_2019_10_44_10.png (17.3 KB)
• VirtualBox_Lubuntu 32-bit 18.04 ALT (DEV)_12_07_2019_10_26_54.png (3.0 KB)

Attached Files

• Plymouth splash screen issue.zip (8.7 KB)