This is fixed in Remmina 1.2, FWIW:

$ sudo snap install remmina

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https://bugs.launchpad.net/bugs/1641176

Title:
  SSH connection never completes, hogs CPU

Status in remmina package in Ubuntu:
  Confirmed

Bug description:
  Since upgrading to yakkety I can't use remmina, it connects over SSH
  and just sits there with a black screen + a blinking caret.

  It also hogs a core of my cpu.

  The only output from the remmina process:

   LANG=C remmina        
  Remmina plugin GKEYRING (type=Secret) registered.
  Remmina plugin VNC (type=Protocol) registered.
  Remmina plugin VNCI (type=Protocol) registered.
  Remmina plugin telepathy (type=Entry) registered.
  Remmina plugin XDMCP (type=Protocol) registered.
  NX: detected keyboard type pc105/pl
  Remmina plugin NX (type=Protocol) registered.
  Remmina plugin RDP (type=Protocol) registered.
  Remmina plugin RDPF (type=File) registered.
  Remmina plugin RDPS (type=Preference) registered.
  Remmina plugin SFTP (type=Protocol) registered.
  Remmina plugin SSH (type=Protocol) registered.
  Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

  (remmina:20860): Gtk-WARNING **: Allocating size to GtkScrollbar
  0x55eaaa8f45b0 without calling
  gtk_widget_get_preferred_width/height(). How does the code know the
  size to allocate?

  The other side connects correctly [see attached sshd.log].

  Perf shows polling to be responsible for the CPU hog:

    11,94%  remmina  [kernel.kallsyms]           [k] do_sys_poll
     5,57%  remmina  libssh.so.4.4.1             [.] ssh_poll_ctx_dopoll
     4,84%  remmina  [kernel.kallsyms]           [k] tcp_poll
     3,99%  remmina  [vdso]                      [.] __vdso_clock_gettime
     3,76%  remmina  [kernel.kallsyms]           [k] sys_poll
     3,71%  remmina  [kernel.kallsyms]           [k] n_tty_poll
     3,47%  remmina  [kernel.kallsyms]           [k] _raw_spin_unlock_irqrestore
     3,45%  remmina  [kernel.kallsyms]           [k] __fget
     3,28%  remmina  [kernel.kallsyms]           [k] _raw_spin_lock_irqsave
     3,27%  remmina  [kernel.kallsyms]           [k] 
entry_SYSCALL_64_after_swapgs
     3,18%  remmina  libssh.so.4.4.1             [.] ssh_select
     2,78%  remmina  [kernel.kallsyms]           [k] __pollwait
     2,05%  remmina  libssh.so.4.4.1             [.] ssh_timeout_update

  And also attached gdb.txt, there's a threaded stacktrace of the
  remmina process interrupted while in this state.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: remmina 1.1.2-3ubuntu2
  ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
  Uname: Linux 4.8.0-27-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Nov 11 18:10:44 2016
  InstallationDate: Installed on 2016-05-06 (188 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  SourcePackage: remmina
  UpgradeStatus: No upgrade log present (probably fresh install)

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