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I recently installed ubuntu 18.04 and wanted to install sublime. Howver I tried running sudo apt-get update before that and I get the following output

Err:1 http://archive.canonical.com/ubuntu bionic InRelease

  Could not connect to archive.canonical.com:80 (91.189.91.15). - connect (111: Connection refused) Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1360:8c01::16). - connect (101: Network is unreachable) Could not connect to archive.canonical.com:80 (91.189.92.150). - connect (111: Connection refused) Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1562::1c). - connect (101: Network is unreachable) Could not connect to archive.canonical.com:80 (91.189.92.191). - connect (111: Connection refused) Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1360:8c01::1b). - connect (101: Network is unreachable)

Err:2 https://download.sublimetext.com apt/stable/ InRelease                   

  Could not connect to download.sublimetext.com:443 (104.236.0.104). - connect (111: Connection refused)

Err:3 http://security.ubuntu.com/ubuntu bionic-security InRelease              

  Could not connect to security.ubuntu.com:80 (91.189.88.149). - connect (111: Connection refused) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::16). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.91.23). - connect (111: Connection refused) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::19). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.88.152). - connect (111: Connection refused) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.88.161). - connect (111: Connection refused) Could not connect to security.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) Could not connect to security.ubuntu.com:80 (91.189.91.26). - connect (111: Connection refused)

Err:4 http://in.archive.ubuntu.com/ubuntu bionic InRelease                     

  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.152). - connect (111: Connection refused) Could not connect to in.archive.ubuntu.com:80 (91.189.88.149). - connect (111: Connection refused) Could not connect to in.archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) Could not connect to in.archive.ubuntu.com:80 (91.189.88.161). - connect (111: Connection refused)

Err:5 http://in.archive.ubuntu.com/ubuntu bionic-updates InRelease

  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable)

Err:6 http://in.archive.ubuntu.com/ubuntu bionic-backports InRelease

  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable)

Reading package lists... Done

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic/InRelease  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.152). - connect (111: Connection refused) Could not connect to in.archive.ubuntu.com:80 (91.189.88.149). - connect (111: Connection refused) Could not connect to in.archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) Could not connect to in.archive.ubuntu.com:80 (91.189.88.161). - connect (111: Connection refused)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable)

W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable)

W: Failed to fetch http://archive.canonical.com/ubuntu/dists/bionic/InRelease  Could not connect to archive.canonical.com:80 (91.189.91.15). - connect (111: Connection refused) Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1360:8c01::16). - connect (101: Network is unreachable) Could not connect to archive.canonical.com:80 (91.189.92.150). - connect (111: Connection refused) Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1562::1c). - connect (101: Network is unreachable) Could not connect to archive.canonical.com:80 (91.189.92.191). - connect (111: Connection refused) Cannot initiate the connection to archive.canonical.com:80 (2001:67c:1360:8c01::1b). - connect (101: Network is unreachable)

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  Could not connect to security.ubuntu.com:80 (91.189.88.149). - connect (111: Connection refused) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::16). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.91.23). - connect (111: Connection refused) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1562::19). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.88.152). - connect (111: Connection refused) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable) Could not connect to security.ubuntu.com:80 (91.189.88.161). - connect (111: Connection refused) Could not connect to security.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) Could not connect to security.ubuntu.com:80 (91.189.91.26). - connect (111: Connection refused)

W: Failed to fetch https://download.sublimetext.com/apt/stable/InRelease  Could not connect to download.sublimetext.com:443 (104.236.0.104). - connect (111: Connection refused)

W: Some index files failed to download. They have been ignored, or old ones used instead.

I am connected via proxy and the internet working fine on browser. I tried the following as well :

m@m-Lenovo-ideapad-500-15ISK:~$ ping archive.ubuntu.com

PING archive.ubuntu.com (91.189.88.161) 56(84) bytes of data.

64 bytes from keeton.canonical.com (91.189.88.161): icmp_seq=1 ttl=45 time=127 ms

64 bytes from keeton.canonical.com (91.189.88.161): icmp_seq=2 ttl=45 time=127 ms

64 bytes from keeton.canonical.com (91.189.88.161): icmp_seq=3 ttl=45 time=127 ms

64 bytes from keeton.canonical.com (91.189.88.161): icmp_seq=4 ttl=45 time=127 ms

64 bytes from keeton.canonical.com (91.189.88.161): icmp_seq=5 ttl=45 time=127 ms

^C

--- archive.ubuntu.com ping statistics ---

5 packets transmitted, 5 received, 0% packet loss, time 4001ms

rtt min/avg/max/mdev = 127.232/127.426/127.761/0.296 ms

env | grep proxy returns the following:

m@m-Lenovo-ideapad-500-15ISK:~$ env | grep proxy

HTTP_PROXY=http://proxy.iiit.ac.in:8080/

FTP_PROXY=http://proxy.iiit.ac.in:8080/

https_proxy=http://proxy.iiit.ac.in:8080/

http_proxy=http://proxy.iiit.ac.in:8080/

ALL_PROXY=socks://proxy.iiit.ac.in:8080/

no_proxy=localhost,127.0.0.0/8,::1

HTTPS_PROXY=http://proxy.iiit.ac.in:8080/

all_proxy=socks://proxy.iiit.ac.in:8080/

ftp_proxy=http://proxy.iiit.ac.in:8080/

Note that apt-get update is working fine without proxy on my mobile hotspot but not via the proxy on my lan / wifi. How do I fix this ?

edit

Trying to install sublime gives the following error :

m@m-Lenovo-ideapad-500-15ISK:~$ sudo apt-get install sublime-text

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following NEW packages will be installed:

  sublime-text

0 upgraded, 1 newly installed, 0 to remove and 90 not upgraded.

Need to get 8,494 kB of archives.

After this operation, 25.1 MB of additional disk space will be used.

Err:1 https://download.sublimetext.com apt/stable/ sublime-text 3176

  Could not connect to download.sublimetext.com:443 (104.236.0.104). - connect (111: Connection refused)

E: Failed to fetch https://download.sublimetext.com/files/sublime-text_build-3176_amd64.deb  Could not connect to download.sublimetext.com:443 (104.236.0.104). - connect (111: Connection refused)

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

However, I can ping with 0 packet loss on the given IP over the same connection

ping 104.236.0.104

PING 104.236.0.104 (104.236.0.104) 56(84) bytes of data.

64 bytes from 104.236.0.104: icmp_seq=1 ttl=48 time=206 ms

64 bytes from 104.236.0.104: icmp_seq=2 ttl=48 time=207 ms

64 bytes from 104.236.0.104: icmp_seq=3 ttl=48 time=206 ms

64 bytes from 104.236.0.104: icmp_seq=4 ttl=48 time=206 ms

64 bytes from 104.236.0.104: icmp_seq=5 ttl=48 time=207 ms

^C

--- 104.236.0.104 ping statistics ---

5 packets transmitted, 5 received, 0% packet loss, time 4006ms

rtt min/avg/max/mdev = 206.334/206.879/207.767/0.593 ms

The following work as a charm :

Append this in ~/.bashrc file

alias iiitproxy='export http_proxy="http://proxy.iiit.ac.in:8080"; export https_proxy="http://proxy.iiit.ac.in:8080";export ftp_proxy="http://proxy.iiit.ac.in:8080"; echo "Acquire::http::proxy "http://proxy.iiit.ac.in:8080/";" | sudo tee /etc/apt/apt.conf'

then run the following in your terminal:

 source ~/.bashrc 

to refresh terminal and,

iiitproxy

I am not too sure what is different here, but it worked

The issue is that the proxy settings are not being passed to the "sudo" level. You are able to ping and wget stuff as a normal user since you have the http_proxy and https_proxy settings set for that current user. When you use sudo, those environment variables are not passed to the elevated user.

The solution is to use -E with sudo to pass on those environment variables to the elevated user.

For example, do the following:

sudo -E apt-get update

It should work.