I do not have an answer but the same issue.
I was unable to use my computer for six months because of a screen problem. In the mean time, I had 39 "packages" that can be "installed" and are waiting, and 39 "Security updates"
When I turn on my computer, instead of allowing me to enter my password and continue, it goes to the command page. There, I am prompted for my user ID and password.
Afterward, it tells me of all of the number of updates etc, but does not download all of them nor install them. I used all of the information above "sudo apt-get update" etc, but I still am unable to get the updates downloaded or installed, or to get this thing up and running.
Spoiler alert, I am not very proficient on this thing, but I can follow directions if told exactly what to do as if I were a moron.
"softreset failed (device not ready)" is my most current message.
I have no idea what this means.