Update for new install instructions. (#912)

* Update for new install instructions.

21.10+ has different requirements to install and run tensorman.

* Tweak phrasing

* Tweak wording

* Remove dependency package from command

* Retain 20.04 LTS instructions

Co-authored-by: Jacob Kauffmann <jacobgkau@users.noreply.github.com>

content/tensorman.md

@@ -29,19 +29,25 @@ redirect_from:
 sudo apt install tensorman
 ```
 
-For NVIDIA CUDA support, the following package must be installed:
+For NVIDIA CUDA support, install the following packages, depending on your Pop!_OS version:
 
-```bash
-sudo apt install nvidia-container-runtime
-```
+| Pop!_OS 21.10 +                    | Pop!_OS 20.04 LTS                            |
+| ---------------------------------- | -------------------------------------------- |
+| `sudo apt install nvidia-docker2`  | `sudo apt install nvidia-container-runtime`  |
 
 The user account working with Tensorman must be added to the `docker` group if that hasn't been done already:
 
 ```bash
 sudo usermod -aG docker $USER
 ```
 
-If Docker was just installed, then a reboot will be needed before Tensorman can be used.
+The last step is to add a kernel parameter:
+
+```bash
+sudo kernelstub --add-options "systemd.unified_cgroup_hierarchy=0"
+```
+
+...and reboot. Then you're ready for liftoff!
 
 ## About Tensorman