After Initial boot temporal background color change to white, green or blue
After selecting Ubuntu in the Grub2 bootmenu, Ubuntu suddenly starts boot up, and the first enocounter is logo with a strange random background color. Later, after 5-7 seconds, the background color changes to the original "normal", ubuntu boots up perfectly for usage.
It happens only on my laptop, I also have desktop to test it.
I'm using Ubuntu 18.04 version.
Edited by Feldwor