For conversion backwards use idn2 -d domain.com
How ever it doesn't stop why it doesn't work for idn package it self
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https://bugs.launchpad.net/bugs/1971715
Title:
22.04 idn -a domain
Public bug reported:
On Ubuntu 22.04 Jammy:
idn -a "xxx-tést.eu"
idn: could not convert from ASCII to UTF-8
And
idn -u "xn--xxx-tst-fya.eu"
idn: could not convert from UTF-8 to ASCII
Expected:
Successfully conversion from ASCII to UTF-8
Ubuntu 20.04 / 18.04 it works fine
Also with idn2 from