This bug occurs with the following conditions are met: 1. IPv4 and IPv6 was configured with netcfg 2. But, IPv6 connectivity is something broken 3. choose-mirror uses wget without timeout
In above case, wget tries to connect with IPv6 first and timeout when 900 seconds has passed. The default timeout of wget is too long, so it seems that installer was stalled. Thus if IPv4: OK and IPv6 OK, there is no problem. (expected) If actual connectivity about IPv4 is OK but IPv6 is NG, it make d-i useless. This seems very edge case, but if it can be fallback to IPv4 appropriately (wget --inet4-only or --prefer-family=IPv4), during choose-mirror process, that situation will be improved. Regards,
