After the update, I select Solus on the boot screen. The Solus icon appears, then the log scrolls across the screen—it’s scrolling so quickly I can’t read it, as you can imagine. After that, it doesn’t switch to the display manager. I can access the TTY screen, but the keyboard isn’t working. I tried it just in case it might be working, but it didn’t help.
I’ll prepare a USB drive at a convenient time, then try chroot and system repair.
Edit: I recently had the opportunity to create a USB drive. I mounted the system and solved my problem using chroot. Thanks also to those who meticulously prepared the help center. I love Solus.