Hello and thank you for your bug report,

Could you share the content of the /var/log/installer directory?

Looking at the journal, it looks like apt could not connect to the archive. Is the network connected to the Internet? What was the result of mirror testing?

There is a known issue for "offline" installations using NVMe drives that should be fixed in today's daily:
https://bugs.launchpad.net/subiquity/+bug/2056730

I am tempted to mark this bug as a duplicate, although in your scenario, it looks like it's not completely offline.

```
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]:   Could not connect to archive.ubuntu.com:80 (2620:2d:4002:1::102). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4002:1::103). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4002:1::101). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4000:1::16). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (91.189.91.82). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (91.189.91.81). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (185.125.190.39). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (91.189.91.83). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (185.125.190.36). - connect (113: No route to host)
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: Err:14 http://archive.ubuntu.com/ubuntu noble/main amd64 python3-dasbus all 1.7-2
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]:   Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: Err:15 http://archive.ubuntu.com/ubuntu noble/main amd64 python3-libnvme amd64 1.7.1-1
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]:   Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: Err:16 http://archive.ubuntu.com/ubuntu noble/main amd64 python3-pyudev all 0.24.0-1
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]:   Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: Err:17 http://archive.ubuntu.com/ubuntu noble/main amd64 nvme-stas all 2.3.1-1
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]:   Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/n/nvme-cli/nvme-cli_2.7.1-1_amd64.deb  Could not connect to archive.ubuntu.com:80 (2620:2d:4002:1::102). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4000:1::19). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4002:1::103). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4002:1::101). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (2620:2d:4000:1::16). - connect (101: Network is unreachable) Could not connect to archive.ubuntu.com:80 (91.189.91.82). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (91.189.91.81). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (185.125.190.39). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (91.189.91.83). - connect (113: No route to host) Could not connect to archive.ubuntu.com:80 (185.125.190.36). - connect (113: No route to host)
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/d/dasbus/python3-dasbus_1.7-2_all.deb  Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/libn/libnvme/python3-libnvme_1.7.1-1_amd64.deb  Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/p/pyudev/python3-pyudev_0.24.0-1_all.deb  Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: E: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/n/nvme-stas/nvme-stas_2.3.1-1_all.deb  Unable to connect to archive.ubuntu.com:http:
Mar 15 03:03:03 ubuntu-server subiquity_log.4279[6373]: E: Some files failed to download
```