please do not use worldwide mirrors, the will not work in most cases, best is to add countries nearby and adding US and German in addition + increase number to 18.
As i can see in cast it only finds two mirrors and seems you are in india… india mirrors will fail the same way as worldwide in 90% of cases.
On the issue with calamares not starting this happens in some cases, when calamartes was crashing or is getting stuck. It will need to reboot into livesession.