It seems they are not present anymore - even in programming mode - with
5.30.1
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No more hexadecimal/binary conversion in gcalctool
https://bugs.launchpad.net/bugs/474028
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Desktop Bugs, which is subscribed to gcalctool in ubunt
These radio buttons are now present only in programming mode
** Changed in: gcalctool (Ubuntu)
Status: New => Won't Fix
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No more hexadecimal/binary conversion in gcalctool
https://bugs.launchpad.net/bugs/474028
You received this bug notification because you are a member of Ubuntu
Deskto