How to install and configure Gramps 5.1.2 on Ubuntu 20.04 (and probably other Ubuntu flavours), and be able to produce a standard family tree chart. There seem to be many ways of working in Gramps - the below works ok for me.
sudo apt-get install gramps
Install extras for Chart views (the first may already be installed on your distro):
sudo apt-get install graphviz sudo apt install gir1.2-goocanvas-2.0
Now start Gramps from the desktop main menu.
Edit, Preferences, General tab, Third Party Addons Management:
Check for Addon updates: Always, What to check: New & Updated,
Clear the ‘Do not ask’ checkbox.
Click ‘Check for Updated Addons Now’ button
Select All, click Install button.
[I got 2 errors: 1. PostgresSQL (1.0.10) Network Chart (0.0.23) error, 2. LifeLineChartView Plugin failed to load required module life-line-chart version 1.7.5; these errors haven’t caused any problems yet]
To make a new family tree: top menu Family Trees, Manage, New, provide a name
On left-hand menu select People, and enter a number of people using the + button at the top; in each case enter at least Given Name, Family Name then using the Events tab:
Hit +, event type Birth, give a date. To add a picture of the person select the Gallery tab, click +, select a picture (jpg is ok), OK, OK, OK
To choose a set of parents, click Families on the left, hit +, select Partner1 and Partner2 using the ‘Select a Person’ buttons. Then if desired on the Events tab, +, Marriage, give a date, OK, OK
Now select an adult parent in the People list (single click), then click Relationships on the left.
Click the + by Family, select Children tab, click +, Add Existing Person button, select the child, OK, OK
To see a pretty standard view of the family tree:
Click People on the left & select a parent (single click)
Click Charts on the left
Menu at top: View, Graph View
I’d be happy to edit this if there are neater quicker methods or if there are errors.