I was having problems with Laz 3.8 and Ubuntu 24. Tried to install Zeos Lib and got the unable to find datetimepicker.pas error. Done a couple of things and finally get rid of it. As some people report permission problems, I find out Laz dir in /usr/share/lazarus/3.8.0/ and confirmed it was owned by root, logically as it is under /usr/share but as I'm the sole user user of my machine I did a: sudo chown -R $USER:$USER /usr/share/lazarus/3.8.0/ and the problem is gone, installed zeoslib and recompiled Laz successfully. That's not too much safety but as I'm the sole user I will take the chances by now but as soon as I can, I'll try to migrate everything to /usr/local/share/ or to my home dir. I didn't know about this issue before, and I compiled a fresh new installation without too much attention where it was going like a default. WIll try this before I start to have many projects.