Add Debian notes

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+Multiarch
+---------
+
+https://wiki.debian.org/Multiarch/HOWTO
+
+```
+dpkg --add-architecture i386
+apt update
+apt install $PKG_NAME:i386
+```
+
+Backports
+---------
+
+List installed:
+
+`dpkg-query -W | grep '~bpo'`