Tvheadend

Can you test and tell what is a problem ?

Looks like a DNS lookup failure. Try nslookup github.com - see what that comes back with (it should be 192.30.252.129 or 192.30.252.130 AFAIK).

You may need to flush a DNS cache (guess) or manually assign the IP address (not good) - or try using a different DNS resolver (e.g. Google's 8.8.8.8 or 8.8.4.4).

I try on modem USB 3G and on Cabel WAN. I set DSN google and nothing...

You test and you can git clone ?

Result for nslookup github.com

Server: 83.142.201.12
Address 1: 83.142.201.12 dns1.profiline.pl

Name: github.com
Address 1: 192.30.252.128 ip1a-lb3-prd.iad.github.com

I just wiped my local version, and git clone https://github.com/tvheadend/tvheadend worked fine...

I set DNS on my router dns google 8.8.8.8 and 8.8.4.4 and still i can not git clone...

You try from console ?

From an xterm terminal command line, yes - not from TTY0 or wherever the console really is.

Have you tried simply renaming your current tvheadend git directory and checking it all out again?

cd
mv tvheadend tvheadend.old
git clone https://github.com/tvheadend/tvheadend

... sort of thing?

Before i git clone i deleted tvheadend.

hts@Synology_DS713:~$ ls
DVR epguide-1.8.1 icon TimeShift update_tvheadend.sh

OK i resolved my problem. On my Debian CHroot i have set bad DNS. In file /etc/resolve.conf i changed the ip server.

Had to be something like that... only DNS made sense. Glad you found it.