[skip ci] Update installation instructions in README

README.md

@@ -141,7 +141,18 @@ Here are a few under development that you can play with now.
 
 The official releases of Xournal++ can be found on the
 [Releases](https://github.com/xournalpp/xournalpp/releases) page. We provide
-binaries for Debian, Ubuntu, MacOS, and Windows.
+binaries for Debian (Buster), Ubuntu (16.04), MacOS (10.13 and newer), and
+Windows. For other Linux distributions (or older/newer ones), we also provide an
+AppImage that is binary compatible with any distribution released around or
+after Ubuntu 16.04.
+
+**A note for Ubuntu/Debian users**: The official binaries that we provide are
+only compatible with the _specific version of Debian or Ubuntu_ indicated by the
+file name. For example, if you are on Ubuntu 20.04, the binary whose name
+contains `Ubuntu-xenial` is _only_ compatible with Ubuntu 18.04. If your system
+is not one of the specific Debian or Ubuntu versions that are supported by the
+official binaries, we recommend you use either the PPA, the Flatpak, or the
+AppImage.
 
 There is also an _unstable_, [automated nightly
 release](https://github.com/xournalpp/xournalpp/releases/tag/nightly) that
@@ -160,7 +171,12 @@ sudo apt update
 sudo apt install xournalpp
 ```
 
-This PPA is provided by the Xournal++ team.
+This PPA is provided by the Xournal++ team. While it has the latest features and
+bug fixes, it has also not been tested thoroughly and may break periodically (we
+try our best not to break things, though).
+
+We eventually also planning on setting up a PPA for stable releases
+([#1013](https://github.com/xournalpp/xournalpp/issues/1013)).
 
 ### Fedora
 
@@ -204,7 +220,7 @@ repository](https://www.archlinux.org/packages/?q=xournalpp).
 To build the latest state of the master branch yourself, use [this AUR
 package](https://aur.archlinux.org/packages/xournalpp-git/).
 
-### Solus Linux
+### Solus
 
 The latest stable release is available in the main repository:
 
@@ -223,7 +239,12 @@ flatpak install flathub com.github.xournalpp.xournalpp
 ```
 
 Note that for Xournal++ to work properly, you must have at least one GTK theme
-and one icon theme installed on Flatpak.
+and one icon theme installed on Flatpak. To enable LaTeX support, you will also
+need to install the TeX Live extension:
+
+```bash
+flatpak install flathub org.freedesktop.Sdk.Extension.texlive
+```
 
 The Flatpak manifest can be found at the [Xournal++ Flatpak packaging
 repository](https://github.com/flathub/com.github.xournalpp.xournalpp), and all
@@ -231,19 +252,34 @@ Flatpak-related packaging issues should be reported there.
 
 ### Windows
 
-**The windows Version has a Bug:**
-Please start Xournal++, touch with the Pen, Quit Xournal++ and start again.
-Then Pen input will be working, until you restart Windows. [#659](https://github.com/xournalpp/xournalpp/issues/659)
+Official Windows releases are provided on the [Releases
+page](https://github.com/xournalpp/xournalpp/releases).
+
+**Notes:**
 
-https://github.com/xournalpp/xournalpp/releases
+* Currently, only WinTab drivers are supported. This is due to a limitation with
+  the underlying library that we use, GTK.
+* There is a GTK that prevents stylus input from working correctly. Please start
+  Xournal++, touch with the stylus, quit Xournal++ and start again. Then stylus
+  input will be working, until you restart Windows. See
+  [#659](https://github.com/xournalpp/xournalpp/issues/659).
 
 ### Mac OS X
 
-Xournal++ will be deliverd with a patched GTK. Else pressure sensitivity is not
-working on Mac [#569](https://github.com/xournalpp/xournalpp/issues/569).
-(GTK-Issue)
+Mac OS X releases are provided on the [Releases
+page](https://github.com/xournalpp/xournalpp/releases).
+
+**Notes:**
 
-https://github.com/xournalpp/xournalpp/releases
+* There have been compatibility problems with Mac OS X Catalina regarding both
+  file permissions and stylus support
+  ([#1772](https://github.com/xournalpp/xournalpp/issues/1772) and
+  [#1757](https://github.com/xournalpp/xournalpp/issues/1757)). Unfortunately,
+  we don't have the resources to adequately support Catalina at this time. Help
+  would be appreciated!
+* Xournal++ will be delivered with a patched GTK. Else pressure sensitivity may
+  not will not work on Mac
+  [#569](https://github.com/xournalpp/xournalpp/issues/569).
 
 ## Building