[Bug 1383470] [NEW] scp does not work (fails at 'Sending command scp -v -t')

[Robin Smith]

Public bug reported:

Following the last update of Ubuntu 14.02, scp (in the default system) has ceased working. It hangs after authentication at the point where it wold start an interactive session.  I've verified that the problem is in my system: scp still works at the target machine and scp won't work on my machine to various hosts.  Output below.
rasmith at rasmith-Lemur-Ultra:~$ scp -v testfil apacentral.org:
Executing: program /usr/bin/ssh host apacentral.org, user (unspecified), command scp -v -t .
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /home/rasmith/.ssh/config
debug1: /home/rasmith/.ssh/config line 17: Applying options for *
debug1: /home/rasmith/.ssh/config line 20: Deprecated option "rhostsauthentication"
debug1: /home/rasmith/.ssh/config line 25: Deprecated option "fallbacktorsh"
debug1: /home/rasmith/.ssh/config line 26: Deprecated option "usersh"
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to apacentral.org [65.19.130.61] port 22.
debug1: Connection established.
debug1: could not open key file '/etc/ssh/ssh_host_key': No such file or directory
debug1: could not open key file '/etc/ssh/ssh_host_dsa_key': Permission denied
debug1: could not open key file '/etc/ssh/ssh_host_ecdsa_key': Permission denied
debug1: could not open key file '/etc/ssh/ssh_host_rsa_key': Permission denied
debug1: could not open key file '/etc/ssh/ssh_host_ed25519_key': No such file or directory
debug1: could not open key file '/etc/ssh/ssh_host_dsa_key': Permission denied
debug1: could not open key file '/etc/ssh/ssh_host_ecdsa_key': Permission denied
debug1: could not open key file '/etc/ssh/ssh_host_rsa_key': Permission denied
debug1: could not open key file '/etc/ssh/ssh_host_ed25519_key': No such file or directory
debug1: identity file /home/rasmith/.ssh/identity type 0
debug1: identity file /home/rasmith/.ssh/identity-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.4_hpn13v11 FreeBSD-20131111
debug1: match: OpenSSH_6.4_hpn13v11 FreeBSD-20131111 pat OpenSSH* compat 0x04000000
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5-etm at openssh.com none
debug1: kex: client->server aes128-ctr hmac-md5-etm at openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: RSA 61:40:9f:26:85:d2:57:34:f9:52:7b:c3:47:9d:7a:ae
debug1: Host 'apacentral.org' is known and matches the RSA host key.
debug1: Found key in /home/rasmith/.ssh/known_hosts:26
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering DSA public key: rasmith at aristotle.tamu.edu
debug1: Server accepts key: pkalg ssh-dss blen 433
debug1: Authentication succeeded (publickey).
Authenticated to apacentral.org ([65.19.130.61]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions at openssh.com
debug1: Entering interactive session.
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
debug1: Sending command: scp -v -t .

(at this point, the command hangs more or less indefinitely until killed
with Ctrl-C)

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ssh 1:6.6p1-2ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-37.64-generic 3.13.11.7
Uname: Linux 3.13.0-37-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Oct 20 15:25:14 2014
InstallationDate: Installed on 2012-10-18 (732 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
PackageArchitecture: all
SourcePackage: openssh
UpgradeStatus: Upgraded to trusty on 2014-05-02 (170 days ago)

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1383470

Title:
  scp does not work (fails at 'Sending command scp -v -t')

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