Hi there. If you hit the space bar it will show you all the kernels you have loaded on the system. If you had installed the kernel-lts2018 bundle you would see something like “Clear Linux OS (Clear-linux-native-4.19.66-70)” You can hit the “e” button if you want to edit the kernel boot parameters. For example, you could add systemd.unit=rescue.target to the boot and that lets you boot into a recovery mode. Booting the live image is the other way I know which you already mentioned.
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