Comment 3 for bug 1578372

I guess I am affected. I want to disable plymouth because of nvidia displaying plymouth ugly (well known issue). In /etc/default/grub I set:
GRUB_CMDLINE_LINUX_DEFAULT="quiet nosplash"

but after system start it shows me:
/scripts/init-bottom/plymouth: line 18: /bin/plymouth: not found

The same problem had another user:
https://www.kubuntuforums.net/showthread.php?69439-Is-plymouth-required
I followed the topic but with no success

I even # all lines in plymouth file located in:
/usr/share/initramfs-tools/scripts/init-premount
No effects.

This bug report might be related to the problem
https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1525699
In comment 6 it says: status: Fix Committed → Confirmed
but I don't want plymouth. With nvidia it looks ugly and seems to slow down loading the system.