Highlight modes are dependent on the file types you are editing. They are useful because they highlight different types of text into different colours. For example it is useful to put all comments into a specific colour. Important language specific keywords can be highlighted in a different colour. Usability wise your brain will then be able to ignore unimportant text and concentrate on important text, simply by colour.
I work a lot with .htaccess files in Ubuntu 16.04, so wanted a highlight mode for .htaccess. Someone has created one and was available for download, called apache.lang. Unfortunately I could not find out how to put this download into the right directory. Here are my instructions.
I have upgraded to Ubuntu 16.04 LTS from Ubuntu 14.04 LTS. There have been very few issues for what is essentially an engine swapout.
Wireless Lan not recognizing Old Connections
On my home wifi I hide the SSID. After the upgrade these connections do not seem to work. Or rather they worked for a while and then seemed to slowly stop working.
When I edit my hidden network connections, the old connections are there but the connect button is greyed out. I thought I had to go to my router, broadcast my SSID, get a connection, then re-hide my SSID. This did not work. It turns out there is a bug for hidden networks.