Document the current findings

Mostly for missing /tmp in the chroot or for libraries which can't be
found (so probably need more packages).

doc/manual/install-language.rst

@@ -62,7 +62,7 @@ packages for Ubuntu as that is the most used at the moment of writing.
      - Default installed in the chroot
    * - Prolog
      - `swi-prolog-core`
-     -
+     - Currently not working.
    * - Python3
      - `pypy3`/`python3`
      - Default installed in the chroot.
@@ -75,7 +75,7 @@ packages for Ubuntu as that is the most used at the moment of writing.
      -
    * - R
      - `r-base-core`
-     -
+     - Currently not working.
    * - Ruby
      - `ruby`
      -
@@ -87,7 +87,7 @@ packages for Ubuntu as that is the most used at the moment of writing.
      -
    * - Swift
      -
-     - See the `Swift instructions`_, unpack the directory in the chroot and install `libncurses6`
+     - See the `Swift instructions`_, unpack the directory in the chroot and install `libncurses6`. Currently not working. 
 
 .. _PyPy3 PPA: https://launchpad.net/~pypy/+archive/ubuntu/ppa
 .. _Swift instructions: https://www.swift.org/documentation/server/guides/deploying/ubuntu.html