Had a similar problem to: forums.ankiweb.net/t/unicode-alt-code-input-on-linux-not-working-with-new-launcher/65532 but it seems the issue was closed.
I am on Linux Mint 22. I recently updated Anki from a 2024 version (not sure, if there is a way to check, just let me know) to Anki 25.09.2.
Previously, I used to be able to type Unicode characters using CTRL + SHIFT + U and an underlined U+ would appear that would allow me to type in the Unicode hexadecimal string. This would generally work in every editor in Anki, from the editor for creating a new card to the editor present when browsing cards or the typing prompts in some of my flashcards. However, I am unable to perform this now in any of the editors in Anki after the update and pressing CTRL + SHIFT + U followed by the hexadecimal string does nothing, it only types the normal string (as if I didn’t press CTRL + SHIFT + U). I tried using CTRL + U but that just enables the underline formatting.
I have verified I can use Unicode characters in the Anki launcher (the CLI) but after booting, I cannot. I can still use Unicode characters in every other application. Based on that, it might be a Qt problem but I am not sure how to troubleshoot that.
I have tried disabling the add-ons and restarting Anki and my computer and it still does not work.
Any ideas?