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I can't install xojo. When I click install in the software center it's not progressing. In the terminal it's stuck in :

gichan02@gichan02-Latitude-D520:~$ sudo apt-get install xojo
[sudo] password for gichan02: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
The following NEW packages will be installed:
 xojo xojo-bin
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 209 MB/209 MB of archives.
After this operation, 596 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
0% [Working]

then after waiting for an hour for progress it says:

Failed to fetch Could not resolve host:

So I added apt repository for 'private-ppa':

deb trusty main

Then when I try 'apt-get update':

GPG error: trusty Release: The following signatures were invalid: NODATA 2

Then I noticed something the Software Sources:Other software TAB:

Added by software-center; credentials stored in /etc/apt/auth.conf

So i go to the '/etc/apt/auth.conf' ,but It cannot be opened and it is not a keyserver.
So i uncheck:

Added by software-center; credentials stored in /etc/apt/auth.conf

GPG error was gone.
But then again I found myself at the beginning of the problem.STUCK at '0% [Working]'.

'Xojo' is the only application that I can't install.Any explanation why is it like that?

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Try from command line and see if it throws errors (if so: add them to your question by editing) (open a terminal and then sudo apt-get install xojo) – Rinzwind May 26 '14 at 14:14
@Rinzwind terminal stack at "0% [Working]" – Gichan May 26 '14 at 14:21
Are you behind a proxy server? If yes, have you added your proxy parameters in System settings-> Network -> Network Proxy? – i08in May 27 '14 at 7:04
@Jobin No.I connect directly. – Gichan May 27 '14 at 7:11
Try ping – bain May 27 '14 at 10:20
up vote 0 down vote accepted

Thank you @bain.

I download .deb file in launhpad instead of downloading it in Software center or terminal. I go to the 'My profile' then click ' View your private PPA subscriptions' so i can view the private PPA permission.Then click the link in the box and download the .deb file for ubuntu.

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