Probably, this bug is due to my customized image. I customized this image with cubic. So, I am sorry if this is not really a bug. Anyway I can solve this problem with connecting the computer to the internet when installing ubuntu.
Probably, this bug is due to my customized image. I customized this image with cubic. So, I am sorry if this is not really a bug. Anyway I can solve this problem with connecting the computer to the internet when installing ubuntu.