Hi, I came from ubuntu 12.04 lts and had to upgrade.
Ubuntu doesn’t have a normal menu so I came to mate.
And now I do not know how to install software. Synaptic isn’t part of system anymore, o.k.
But if I want to install for example QGIS, any CAD system, what to do? Is apt get … the only way?
Thank you
am2
Hello,
You have to open the "Welcome-Window" (see applications menu).
Once you opened Welcome, visit "Software".
Here you will find an link to software centres.
Best regards
Sorry, but I cannot find the welcome window, it came when I started, but now it is not to be found 
In German there is a menu “Anwendungen” that means applications
Among this there are
Where to look for it?
In that case, for Synaptic:
sudo apt-get install synaptic
Or, for a more user-friendly GUI:
sudo add-apt-repository ppa:appgrid/stable
sudo apt-get update
sudo apt-get install appgrid
System | Administration | Ubuntu Software Center
Thank you, so I found it:
System | Administration | Welcome
But that's not the end of my questions 
How can I install this via Mate? Or do I have to install synaptic or anything else?
Thank you all for your help
See also:
And:
When you use the Software Center, type near the top right and it will subset the results as you type. If the program is installed, you will see a green dot near the icon. Or use synaptic, there are many ways to do a task on Linux
I googled “ubuntu lazarus”
I searched for “ubuntu qgis”
Hope this helps
Please read my first reply again. Click on the highlighted Link (red rounded) and install Ubuntu Software-Center.
When installed, open Ubuntu Software-Center. On the right you can see a search box. Type in "Lazarus" (without "").
You will find the program. So i find it here. The same with QGis.
If you haven’t found a way yet there is another method.
Go to the welcome screen
Click More apps
Click install at the software center
