Update offline installation packages

Ubuntu 18.04, Ubuntu 18.04 ARM, Debian, Ubunut 16.04 link name

Author: Tara Raj

WSL/install-manual.md

@@ -21,7 +21,10 @@ In these cases, while WSL itself is available, how do you download and install L
 # Downloading distros
 
 If the Windows Store app is not available, you can download and manually install Linux distros by clicking these links:
-* [Ubuntu](https://aka.ms/wsl-ubuntu-1604)
+* [Ubuntu 18.04](https://aka.ms/wsl-ubuntu-1804)
+* [Ubuntu 18.04 ARM](https://aka.ms/wsl-ubuntu-1804-arm)
+* [Ubuntu 16.04](https://aka.ms/wsl-ubuntu-1604)
+* [Debian GNU/Linux](https://aka.ms/wsl-debian-gnulinux)
 * [OpenSUSE](https://aka.ms/wsl-opensuse-42)
 * [SLES](https://aka.ms/wsl-sles-12)
 
@@ -52,4 +55,4 @@ In the above example, `curl.exe` is executed (not just `curl`) to ensure that, i
 > Note: Using `curl` might be preferable if you have to invoke/script download steps using Cmd shell and/or `.bat` / `.cmd` scripts.
 
 # Installing your distro
-For instructions on how to install your downloaded distro(s), please refer to the [Windows Desktop](install-win10.md) or [Windows Server](install-on-server.md) installation instructions.
+For instructions on how to install your downloaded distro(s), please refer to the [Windows Desktop](install-win10.md) or [Windows Server](install-on-server.md) installation instructions.