add ubuntu details

Author: rosemarymarano

documentation/1.0/content/setup/install.md

@@ -15,7 +15,51 @@ sudo yum localinstall wktui-1.0.0.x86_64.rpm
 ```
 
 - On Oracle/RedHat/CentOS (and some others), use either `yum` or `dnf`
-- On Ubuntu/Debian (and some others), use `apt-get`
+- On Ubuntu, run:
+```
+sudo dpkg -i wktui_1.0.0_amd64.deb
+```
+You may see output like the following:
+```
+Selecting previously unselected package wktui.
+(Reading database ... 70158 files and directories currently installed.)
+Preparing to unpack wktui_1.0.0_amd64.deb ...
+Unpacking wktui (1.0.0-784) ...
+dpkg: dependency problems prevent configuration of wktui:
+ wktui depends on gconf2; however:
+  Package gconf2 is not installed.
+ wktui depends on gconf-service; however:
+  Package gconf-service is not installed.
+ wktui depends on libnotify4; however:
+  Package libnotify4 is not installed.
+ wktui depends on libappindicator1; however:
+  Package libappindicator1 is not installed.
+ wktui depends on libxtst6; however:
+  Package libxtst6 is not installed.
+ wktui depends on libsecret-1-dev; however:
+  Package libsecret-1-dev is not installed.
+
+dpkg: error processing package wktui (--install):
+ dependency problems - leaving unconfigured
+Processing triggers for shared-mime-info (1.15-1) ...
+Processing triggers for mime-support (3.64ubuntu1) ...
+Errors were encountered while processing:
+ wktui
+```
+If so, then run:
+```
+sudo apt-get install -f
+```
+If you run `wktui` from an OS terminal shell. You may see this:
+```
+wktui
+libGL error: No matching fbConfigs or visuals found
+libGL error: failed to load driver: swrast```
+```
+This is harmless and can be removed by setting this environment variable before launching `wktui`:
+
+`export LIBGL_ALWAYS_INDIRECT=1`
+
 
 ### Application Startup