When the error "initramfs" appears in the EFI system, it means that there is an issue with the initial RAM file system. This error can be caused by various factors, such as a failed attempt to install kernel files for a kernel that does not exist, a failing hard drive, or an accidental touch of a system file[1][2][4]. One possible solution is to run the "fsck" command to check and repair the file system[2][5]. However, this error can also be a sign of a failing hard drive, so it is recommended to back up important data and seek professional help if the issue persists[4].