As of today mojang seems to have "updated" the launcher, breaking it for a lot of people. Possibly just linux, but if you're having problems with the launcher crashing, update to oracle java version 8. Fixed it for me.
Are you new to minecraft or this server? If so be sure to visit the Help Center! To get there simply type /visitregion helpcenter This HelpCenter contains The rules, plugins, and ranks all explained in detail! Also it has some Minecraft Tricks and Building tips! There is a section that tells where to go and the sections are easy to find! If you have any Questions or concerns /mail send SMagicBaconS or /mail send Internal_overide and we will be more than happy to help you!