Linux Hint shows you how to start Ubuntu from Initramfs.
How Do I Start Ubuntu From Initramfs?
The “initramfs” error can affright you, but luckily this error has a very easy and straightforward solution. This error occurs when your memory got corrupted, especially the drive containing the operating system, and does not let it boot. To fix it, simply use the "file system consistency check" or “fsck” utility. How to start Ubuntu from Initramfs is explained in this article.
