@Pr2:
Oh... sorry... I see... you meant stopping Enigma2 before installing the ServiceApp package. Well, in that case, yes. You're right.
It confused me because you used the wrong command, namely init 3. This ensures that the Enigma2 process and possibly other Run-Level-3 services are started (but this is probably no longer used in the case of Linux set-top boxes). If you want to stop Enigma2, as you know, init 4 and not init 3 is used.
It would be more clean if it is planned to restart the entire set-top box anyway, always first stop the Enigma2... and only then install system packages. On the other hand, the installation package must have these things solved in the installation script and, in case of urgent need, it must automatically stop Enigma2.