added notes

howto - missing or expired repo keys.md

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+# Ubuntu - Missing/expired Repo keys
+
+Find and remove expired key
+
+```shell
+sudo apt-key list
+sudo apt-key del <key> # last 8 characters of hash
+```
+
+Install latest key (i.e.)
+
+```shell
+curl -O https://packages.cloud.google.com/apt/doc/apt-key.gpg && sudo apt-key add apt-key.gpg
+```

howto - motherboard Windows key.md

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+# Motherboard Windows Key
+
+A lot of Motherboards come with the Windows key too, you can just find it under Linux for a nice licensed VM.
+
+```shell
+sudo cat /sys/firmware/acpi/tables/MSDM
+```