Suddenly My Ubuntu 16.04 LTS giving me a issue, I can't open files manger as well as screenshots app.  So I dig into the problem and found this temporary solution for file manager. Still searching for permanent solution. Ubuntu is very buggy since and then, not stable any way.

Step 1:

@jpudasaini:~$ nautilus -q

(nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed

(nautilus:6210): GLib-GIO-CRITICAL **: g_dbus_interface_skeleton_unexport: assertion 'interface_->priv->connections != NULL' failed

(nautilus:6210): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion 'GDK_IS_SCREEN (screen)' failed

(nautilus:6210): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(nautilus:6210): GLib-GObject-CRITICAL **: g_signal_connect_object: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

Step 2:

jpudasaini@jpudasaini:~$ nautilus
Nautilus-Share-Message: Called "net usershare info" but it failed: Failed to execute child process "net" (No such file or directory)

Here is another tutorial running Cisco ASAv on GNS3 using Qemu.

For Configure GNS3

In My case I have used ASAv952-204.qcow2

Go to the GNS3>Edit>Preferences>QEMU>Qemu VMs>New
Follow on screen procedure. 

Don't forget to enable kvm and memory allocation. 



Now you can see I can run ASAv 9.5.2

Blank Password.

This time lets have tutorial on Cisco XR 9k series router image running on the GNS3. Please don't ask for the XR image. Your are smart enough to get it.

My system configuration:

Ubuntu 16.04
GNS3 1.4
RAM 8Gig
i7 processor

Used XR Image
iosxrv-k9-demo-6.0.1.qcow2

This image is VIRL extracted image.

You need to convert this image into QEMU image, follow this link

I strongly recommend you to run it on the Linux system.

Now you have converted image, then go to the GNS3>Edit>Preferences>QEMU>Qemu VMs>New
then follow the onscreen procedure.

Setting for QEMU XR Image.

RAM:- 4Gig
CPU:- 1

Somebody ask me to run Cisco EPIC VPN lab test provide by the Cisco. I just try it done but Anyconnect client doesn't seems to work on ubuntu system. The error message was

sudo apt-get install lib32z1 lib32ncurses5

sudo apt-get install network-manager-openconnect

sudo systemctl daemon-reload