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•  Failed to fetch http://ppa.launchpad.net/groovy-dev/groovy/ubuntu/dists/trusty/main/binary-i386/Packages  404  Not Found

sudo add-apt-repository --remove ppa:groovy-dev/groovy

•  Install jdk8

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer 

• Install openjdk8 

sudo add-apt-repository ppa:openjdk-r/ppa 
sudo apt-get update
sudo apt-get install openjdk-8-jdk

• sudo: add-apt-repository: command not found 

sudo apt-get install software-properties-common python-software-properties

• turn off autostart DE in ubuntu:
  in /etc/default/grub
  change:
      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  to:
      GRUB_CMDLINE_LINUX_DEFAULT="text"
  run:
      ~$ sudo update-grub
•  gtk crash on kde when click on list "Assertion `!_button._widget' failed."

Another workaround mentioned there is for Oxygen, edit the normally already existing file /usr/share/themes/oxygen-gtk/gtk-2.0/gtkrc and change

`GtkComboBox::appears-as-list = 1`

into

`GtkComboBox::appears-as-list = 0`

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