title: Apt update - stuck on 0%
body: <p>I have problem with "0% Working". I saw <a href="https://askubuntu.com/questions/498462/apt-get-stuck-at-0-working?utm_medium=organic&amp;utm_source=google_rich_qa&amp;utm_campaign=google_rich_qa">same posts</a> before, tried to do what there adviced but it dont help me.
  My system is:</p>
  
  <pre><code>  lsb_release -a No LSB modules are available. Distributor ID: Ubuntu
   Description:    Ubuntu 16.04.4 LTS Release:        16.04 Codename:    
   xenial
  </code></pre>
  
  <p>I have</p>
  
  <p><a href="https://i.stack.imgur.com/sMF2R.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sMF2R.gif" alt="My problem is 0% Working"></a></p>
  
  <p>I have Google DNS</p>
  
  <pre><code># Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
  #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
  nameserver 8.8.4.4
  nameserver 8.8.8.8
  </code></pre>
  
  <p>I have good ping to ubuntu site:</p>
  
  <pre><code>PING us.archive.ubuntu.com (91.189.91.26) 56(84) bytes of data.
  64 bytes from hanger.canonical.com (91.189.91.26): icmp_seq=1 ttl=54 time=127 ms
  ...
  </code></pre>
  
  <p>Here my  /etc/apt/sources.list <a href="https://pastebin.com/usJHp95b" rel="nofollow noreferrer">https://pastebin.com/usJHp95b</a></p>
  
  <p>Now i see that i cant install any programm like "dig" or nmap:</p>
  
  <pre><code>sudo apt install nmap
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  E: Unable to locate package nmap
  </code></pre>
  
  <p>Previos time all worked fine. What i did before: 1) Installed OpenVPN for tests. 2) Get new router from my ISP but seems like i did there same settings for network. 3) Our dear goverment block Telegram (over 15 million IP adress Google and Amazon, maybe here a problem?)</p>
  
  <p>Also i have message from system when i logged in system from monitor (not ssh),
  "sendbytes: NAK bailout. "
  its repeat every 5 sec +-</p>
  
  <p>Sorry for bad english! 
  Any suggestions?</p>