"InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)" when updating package list - apt

Question

Here is what I see in my terminal:
user#user-OptiPlex-9020:~$ sudo apt-get update
Ign http://extras.ubuntu.com trusty InRelease
Ign http://in.archive.ubuntu.com trusty InRelease
Get:1 http://dl.google.com stable InRelease
100% [1 InRelease gpgv 1,661 B] [Connecting to 192.168.0.90 (192.168.0.90)] [WaSplitting up /var/lib/apt/lists/partial/dl.google.com_linux_chrome_deb_dists_stable_InRelease intoIgn http://dl.google.com stable InRelease
E: GPG error: http://dl.google.com stable InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
I have the required authentication information in /etc/apt/apt.conf file:
Acquire::http::proxy "http://username:password#192.168.0.90:8080/";
Acquire::https::proxy "https://username:password#192.168.0.90:8080/";
Acquire::ftp::proxy "ftp://username:password#192.168.20.0:8080/";
I am not able to figure out the problem.

Answer 1

One way for that is to remove dl.google.com from your software update repositories,
for that, use System Settings -> Software & Update -> Other Software
and uncheck dl.google.com
then run
sudo apt-get update
I could not find a way to keep google in circle because I live in Iran & google refuses service to users in Iran.

Answer 2

Just follow below 3 easy steps, and it works for me:
Step 1: Edit google-chrome.list repo file:
$ sudo nano /etc/apt/sources.list.d/google-chrome.list
Step 2: Comment the "dl.google.com..." line and save the file:
# deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
Step 3: Run update again:
$ sudo apt-get update

Answer 3

You can try remove some repositorie, be careful with that repositories to you deletes
sudo rm /etc/apt/sources.lists.d/***.list
and later
sudo apt-get update -y

Answer 4

Sometimes problem is with your ISP service providers. Your IP might be in blacklist. Please check on https://mxtoolbox.com/blacklists.aspx and type in your IP to see the results. If you see your IP as listed, you can click on details and request for delisting your IP
I had the same problem and without a proper knowledge, I re-installed the OS and had the same issue. I fixed this issue by delisting from blacklist.