It should rename the directory name qemux86_64 to qemux86-64 in http://adtrepo-dev.yoctoproject.org/1.8.2-c9f0a99050ec0050f0dbcd55d0cd2ab18848113f-fido/rootfs/ . Otherwise the adt-installer can not find the correct rootfs.
Renamed the directory in question on the adprepo-dev server. These directories were created manually, so this was a one-off error when the directory hierarchy was created for 1.8.2.
Verified.