[tex-live] Error installing install-tl-unx.tar.gz

[Newman, Chuck]

# ./install-tl
cannot contact mirror.ctan.org, returning a backbone server!
Loading http://www.ctan.org/tex-archive/systems/texlive/tlnet/tlpkg/texlive.tlpdb
./tlpkg/installer/xz/xzdec.x86_64-linux: (stdin): File format not recognized
./install-tl: signature verification error of /tmp/0etZ_Fw4Ec/paQlkCVfEv from http://www.ctan.org/tex-archive/systems/texlive/tlnet/tlpkg/texlive.tlpdb: cryptographic signature verification of
  /tmp/0etZ_Fw4Ec/GiM4SAMCXi
against
  http://www.ctan.org/tex-archive/systems/texlive/tlnet/tlpkg/texlive.tlpdb.sha512.asc
failed. Output was
gpg: no valid OpenPGP data found.
gpg: the signature could not be verified.
Please remember that the signature file (.sig or .asc)
should be the first file given on the command line.

Please report to texlive at tug.org