Nada está errado. Como observa o Arch Wiki :
For this initialization entropy is required. Moving your mouse around, pressing random characters at the keyboard or running some disk-based activity (for example in another console runningls -R /
orfind / -name foo
) should generate entropy. If your system does not already have sufficient entropy, this step may take hours; if you actively generate entropy it will complete much more quickly.
Você pode ler mais sobre a entropia no kernel do Linux na Wikipedia .