Note: I can't login back to the default kernel that came with Ubuntu 18.0.4 TLS (Notice I updated the OS once)
$ dpkg --list | grep linux-image
ii linux-image-4.15.0-20-generic 4.15.0-20.21 amd64 Signed kernel image generic
ii linux-image-generic 4.15.0.20.23 amd64 Generic Linux kernel image
ii linux-image-unsigned-4.18.0-041800rc1-generic 4.18.0-041800rc1.201806162031 amd64 Linux kernel image for version 4.18.0 on 64 bit x86 SMP
I installed the mainline kernel
$ uname -r 041800rc1- generic
4.18.0-
Note: I can't login back to the default kernel that came with Ubuntu 18.0.4 TLS (Notice I updated the OS once) 4.15.0- 20-generic 4.15.0-20.21 amd64 Signed kernel image generic unsigned- 4.18.0- 041800rc1- generic 4.18.0- 041800rc1. 201806162031 amd64 Linux kernel image for version 4.18.0 on 64 bit x86 SMP
$ dpkg --list | grep linux-image
ii linux-image-
ii linux-image-generic 4.15.0.20.23 amd64 Generic Linux kernel image
ii linux-image-