ubuntu 19.10 crash when lazarus runs

Question

Since I have installed Ubuntu 19.10 and lazarus 2.0.2 package, when I want to run Lazarus IDE, I have 30 seconds delay and then ubuntu freezes , mouse and keyboard no respond. Can everybody help me Thanks

Answer 1

The previously linked page Some applications on Ubuntu 19.10 very slow to start, provides solutions that worked for me.

1. (Temporary Solution) Launch the program as the superuser:

   sudo ./project1
   

2. (Temporary Solution) Launch the application with launch:

   dbus-launch --exit-with-session ./project1
   

3. (Permanent Solution) Run the following command and restart your computer:

   sudo apt-get install appmenu-gtk2-module
   

Answer 2

Unfortunately, it seems that Ubuntu 19.10 it experiencing some difficulties with Gtk2 applications, for some people (e.g. Some applications on Ubuntu 19.10 very slow to start).

I had the same experience you did (except using Lazarus 2.0.6 distributed from the Lazarus web page), as have others (see https://forum.lazarus.freepascal.org/index.php/topic,47240.0.html).

The only way I was able to get Lazarus to work acceptably was to use fpcupdeluxe to build the Qt5 version of Lazarus, which seems to perform fine under 19.10.