Hi @ApiDevMarc,
Please try to use these commands instead>
1.# sudo gvm-stop
2.# sudo runuser -u _gvm – greenbone-nvt-sync --rsync
2.1#NOTE: The _gvm is the gmv’s user name, so you need to replace it with your user name you created
3.# sudo greenbone-scapdata-sync
4.# sudo greenbone-certdata-sync
5.# sudo reboot