=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching sks-1.1.5.tgz
=> Total size: 362941 bytes
ftp: Error retrieving file `503 Backend unavailable, connection failed'
fetch: Unable to fetch expected file sks-1.1.5.tgz
=> Checksum SHA1 OK for sks-1.1.5.tgz
=> Checksum RMD160 OK for sks-1.1.5.tgz
=> Checksum SHA512 OK for sks-1.1.5.tgz