Pressing any button (e.g. letter) types it twice in 1.8.0

[vlastimil]

Hello,

OS: Linux Mint 18.3 Cinnamon 64-bit.

I am a recreational user of Lazarus and an advanced user of Linux.

I have just edited my Q&A of how to install Lazarus on Linux Mint 18 and installed it:
https://unix.stackexchange.com/questions/299758/lazarus-ide-not-correctly-installable-from-repository-in-mint-18-x

Now, what is the problem:

When I type, IT TYPES EVERYTHING TWICE, literally. See image in attachment.

I want to start a new project, hence I need this resolved soon.

Thank you.

EDIT1:

I have found that if I launch lazarus with sudo, it types normal. Where could be the problem?

[Handoko]

Hello vlastimil,
Welcome to the forum.

This issue happens on Ubuntu, its variants and/or GNOME Desktop users. It has been reported here:
https://bugs.freepascal.org/view.php?id=30863

You can find the solutions here:
http://wiki.freepascal.org/Lazarus_Faq#Typing_in_edit_fields_generate_duplicate_letters

I personally choose to disable the Input Manager. To do it on Ubuntu Mate:
Ubuntu main menu > System > Control Center > Language Support > Keyboard input method system > select: none.

---edit---
After you change the setting, you need to restart your computer.

[vlastimil]

Alright, there has been some XIM selected in Input Method in System Settings.

But the problem persists after setting it to NONE.

Any further things I could try?

[vlastimil]

Ok, problem resolved with that setting AND reboot.

Thank you very much.

[avra]

This issue happens on Ubuntu and its variants.

It also happens on Manjaro Cinnamon. On Manjaro XFCE it does not happen. I gave up Cinnamon because of this bug.