ahci error during install of 6.4

Hi,

I'm currently trying to install 6.4 on a Dell Latitude E7470 laptop (Intel Skylake).

During the whole disk (G) partitioning process, setup fails with the following messages:

newfs: wtfs: write error on block 8352576: Input / output error
ahci0: attempting to idle devices
atascsi_disk_sync_done: error
ahci0: NCQ errored slot 14 is idle (20000000 active)

Assuming that perhaps there might be a bad block on the drive (nvme ssd) I've run read / write bad block tests on the whole drive, but nothing showed.

The drive has had a working install of Ubuntu up till now, and I've subsequently installed Xubuntu on it successfully.

As it stands I can't proceed with the install; very sad.

Any help would be appreciated.

Regards,

Paul S.

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