Problem with cryptsetup; Ubuntu doesn’t boot as usual

Question

Until now, my computer was booting correctly. But after restarting it in the afternoon, something happened:

• First, I get a message at booting, just before entering the cryptestup password: cryptsetup: warning cryptswap1: couldn't determine device type
• After booting, my computer doesn’t recognize the second screen and won’t let me change the resolution of the screen.

I didn’t change anything about cryptsetup (password…) and didn’t mount new disks.

What should I do?

Answer 1

I just found that the two problems were not connected:

• For the first one, the solution was here:

  sudo swapoff -a
  sudo update-initramfs -c -k all
  sudo swapon -a
  

• For the second one, I just switched back from X-11 drivers to Nvidia ones.