Boot time of B2Qt is really long with Qt 5.10. This is because QRandomGenerator now uses getentropy which blocks during boot until kernel outputs message "random: nonblocking pool is initialized".

At least qdbd and qtlauncher are affected by this.

Possible solutions:

1. Disable feature "getentropy" from Boot2Qt builds
   • This is the behavior in Qt < 5.10.x
   • Only difference in the entropy of randomness is in early boot
2. Add "rng-tools" for inputting entropy to the kernel
   • Speeds up initialization of nonblocking pool
   • On devices with HW random generator, this adds real entropy to the kernel pool
   • On devices without HW random generator, this adds entropy from /dev/urandom to the kernel pool
3. Setting  QT_HASH_SEED for the affected processes
   • export QT_HASH_SEED=0
   • export QT_HASH_SEED=`dd if=/dev/urandom bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%u"'`
4. Something else...

Some discussion about the issue is in comments of QTBUG-63029