ChromeOS 75.0.3759.4 is currently being rolled out to users in the dev channel. Unfortunately if you have chosen to enable the GPU, your Crostini instance may no longer function. You may get the following error message when launching Termina via crosh
Error: routine at frontends/vmc.rs:118 `vm_start(vm_name,user_id_hash,matches.opt_present("enable-gpu"))`
Fortunately this can be fixed by disabling Crostini and re-creating the container. You can then restore a backup if you happen to have one from before the update. Here are the steps to backup your container, install the update and restore the container