I had installed MakeMKV from source files on an Ubuntu Linux system . It had been working then, but when I tried to run the program today, I saw the message "Application failed to initialize NO_ANSWER_FROM_MAKEMKVCON".
I had updated the operating system and other applications on the system in the intervening months, so I knew it was possible that the upgrade changed or removed libraries that makemkvcon depends on. I had upgraded the operating system from Ubuntu 25.10 (Questing Quokka) to 26.04 LTS (Resolute Racoon). The error means the MakeMKV graphical user interface (GUI) can't communicate with its backend console process, makemkvcon. I.e., the GUI is waiting for a response from makemkvcon and that process isn't starting or is crashing, possibly because of a missing required dependency such as a missing or changed library file. To try to determine if that was the case and, if so, which library might be associated with the problem, I ran makemkvcon from a terminal window.
alice@Wonderland:~$ which makemkvcon /usr/bin/makemkvcon alice@Wonderland:~$ makemkvcon makemkvcon: error while loading shared libraries: libavcodec.so.61: cannot open shared object file: No such file or directory alice@Wonderland:~$
I was able to resolve the problem by reinstalling MakeMKV from the source files. When I did that and re-registered the application, it started normally.
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