SSH keys don't import properly

[CrazySky]

Ubuntu 16.04

I'm trying to import ssh key with name 'id_rsa.1'. Open -> Import: I choose the ssh key and click 'Ok'.
Then I wrote my password for key and click 'Ok'.
After that key was imported to Gnome2 Key Storage but must be in OpenSSH.
Another several new attempts have same result.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: seahorse 3.18.0-2ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Jun 2 01:25:03 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-01-22 (496 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: seahorse
UpgradeStatus: Upgraded to xenial on 2016-05-04 (28 days ago)