Expanding a GUI tree view on Ubuntu with the keyboard

Question

I'm using Synaptic and Ubuntu, and when installing something it gives a tree view widget. ("To be removed", "Unchanged") where you can expand items by pressing on the + icon.

My question: How can I expand these items with the keyboard? On Windows, Right would work, but here it doesn't work.

Answer 1

Can't try it right now, but maybe:

• tab to cycle the focus between the widgets and select the tree;

• up / down to select the tree items;

• space to expand/contract the tree items.

Answer 2

Use Shift + Right to expand and Shift + Left to contract.

Answer 3

The keys + and - work in most tree view widgets (regardless of OS) for expand and collapse, respectively.