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Re: Booting Linux mint

Have a look at https://matadornetwork.com/abroad/the-ultimate-guide-to-computer-keyboards-around-the-world/ (eg Croatia and Czech layouts). 
and
https://www.technipages.com/linux-mint-change-keyboard-layout
If the latter does not help, try as a search term "linux mint change keyboard layout" and you'll find some more links.

Keith
Have a look at https://matadornetwork.com/abroad/the-ultimate-guide-to-computer-keyboards-around-the-world/ (eg Croatia and Czech layouts). 
and
https://www.technipages.com/linux-mint-change-keyboard-layout
If the latter does not help, try as a search term "linux mint change keyboard layout" and you'll find some more links.

Keith