type apt-get install linux-generic-lts-quantal xserver-xorg-lts-quantal to install both the new kernel and the new xorg subsystem.ĩ. type apt-get update to make sure the guest is updated.Ĩ. You may safely remove the VBoxGuestAdditions-4.2.12 folder too afterwards but it's not necessary.ħ. This will uninstall 4.2.12 additions from your guest. In root mode, type cd /opt/VBoxGuestAdditions-4.2.12.Ħ. After networking has been enabled successfully, select the option to start a root session.ĥ. If this fails for some reason, you must follow a slightly different procedure explained in PS 1 but normally you should be ok.Ĥ. That will remount your system as read/write. On the recovery mode's blue screen, enable networking so that you can install packages. Start your guest but hold down the shift button right after the vm startup white screen appears, so that you can interrupt normal boot and view grub options.ģ. In order to avoid this, please follow the instuctions on 1, 2, 3 and then PS 1 since that installation is done after the user has logged in their account and everything is decrypted.ġ. UPDATE: After some additional tests, I found out that on vm's that are installed on encrypted partitions or use encrypted home folders, the procedure may fail. So, let's go and do it:īEFORE YOU START DOING ANYTHING, I would strongly recommend you clone your affected vm using vbox's clone feature and work on the clone so that you won't damage your initial vm in case something goes terribly wrong. Luckily, Canonical has released two packages you can install on your guest systems and update them to use the new xorg subsystem and kernel used in version 12.10 without stopping using 12.04. The problem is caused by an incompatibility of the new VB additions with the xorg subsystem used in 12.04 and previous releases. Just follow the instructions and you'll be fine. This is the solution that I have checked and verified on 2 vm's and it's working. I faced this black screen problem right after the latest 4.2.12 update too.
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