I had to tweak the time outs a bit, as I quickly get some errors from
the networking stack (like 7s or so), but I could successfully verify
the fix now, using a standard ubuntu:bionic lxd container, and modifying
the routes, and setting a lower timeout:

+ ip r del default
+ ip r add default via 10.33.102.254 dev eth0
+ ip -6 r del default
+ ip -6 r add default via fe80::689a:53ff:fe6f:8f85 dev eth0
RTNETLINK answers: File exists
+ cat
+ apt update -o acquire::http::timeout=1
Err:1 http://archive.ubuntu.com/ubuntu bionic InRelease       
  Could not connect to archive.ubuntu.com:80 (91.189.88.162), connection timed 
out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::21), 
connection timed out Could not connect to archive.ubuntu.com:80 
(91.189.88.152), connection timed out Could not connect to 
archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out Could not 
connect to archive.ubuntu.com:80 (91.189.88.149), connection timed out Could 
not connect to archive.ubuntu.com:80 (2001:67c:1560:8001::14), connection timed 
out Could not connect to archive.ubuntu.com:80 (91.189.88.161), connection 
timed out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::17), 
connection timed out
Err:2 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
  Could not connect to archive.ubuntu.com:80 (91.189.88.162). - connect (113: 
No route to host) Could not connect to archive.ubuntu.com:80 
(2001:67c:1360:8001::21). - connect (113: No route to host) Could not connect 
to archive.ubuntu.com:80 (91.189.88.152), connection timed out Could not 
connect to archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out 
Could not connect to archive.ubuntu.com:80 (91.189.88.149), connection timed 
out Could not connect to archive.ubuntu.com:80 (2001:67c:1560:8001::14), 
connection timed out Could not connect to archive.ubuntu.com:80 
(91.189.88.161), connection timed out Could not connect to 
archive.ubuntu.com:80 (2001:67c:1360:8001::17), connection timed out
Reading package lists... Done                                 
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  
Could not connect to archive.ubuntu.com:80 (91.189.88.162), connection timed 
out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::21), 
connection timed out Could not connect to archive.ubuntu.com:80 
(91.189.88.152), connection timed out Could not connect to 
archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out Could not 
connect to archive.ubuntu.com:80 (91.189.88.149), connection timed out Could 
not connect to archive.ubuntu.com:80 (2001:67c:1560:8001::14), connection timed 
out Could not connect to archive.ubuntu.com:80 (91.189.88.161), connection 
timed out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::17), 
connection timed out
W: Failed to fetch 
http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Could not 
connect to archive.ubuntu.com:80 (91.189.88.162). - connect (113: No route to 
host) Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::21). - 
connect (113: No route to host) Could not connect to archive.ubuntu.com:80 
(91.189.88.152), connection timed out Could not connect to 
archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out Could not 
connect to archive.ubuntu.com:80 (91.189.88.149), connection timed out Could 
not connect to archive.ubuntu.com:80 (2001:67c:1560:8001::14), connection timed 
out Could not connect to archive.ubuntu.com:80 (91.189.88.161), connection 
timed out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::17), 
connection timed out
W: Some index files failed to download. They have been ignored, or old ones 
used instead.

real    0m6.007s
user    0m0.139s
sys     0m0.026s


after 1.6.2:

lxc exec bb  -- bash $PWD/rep4 apt -y install $PWD/Downloads/*_1.6.2_amd64.deb 
+ ip r del default
+ ip r add default via 10.33.102.254 dev eth0
+ ip -6 r del default
+ ip -6 r add default via fe80::689a:53ff:fe6f:8f85 dev eth0
+ cat
+ apt -y install /home/jak/Downloads/apt_1.6.2_amd64.deb 
/home/jak/Downloads/libapt-pkg5.0_1.6.2_amd64.deb
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'apt' instead of '/home/jak/Downloads/apt_1.6.2_amd64.deb'
Note, selecting 'libapt-pkg5.0' instead of 
'/home/jak/Downloads/libapt-pkg5.0_1.6.2_amd64.deb'
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
Suggested packages:
  apt-doc aptitude | synaptic | wajig dpkg-dev
The following packages will be REMOVED:
  apt-utils ubuntu-minimal
The following packages will be upgraded:
  apt libapt-pkg5.0
2 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
Need to get 0 B/1966 kB of archives.
After this operation, 835 kB disk space will be freed.
Get:1 /home/jak/Downloads/libapt-pkg5.0_1.6.2_amd64.deb libapt-pkg5.0 amd64 
1.6.2 [801 kB]
Get:2 /home/jak/Downloads/apt_1.6.2_amd64.deb apt amd64 1.6.2 [1166 kB]
(Reading database ... 28484 files and directories currently installed.)
Preparing to unpack .../libapt-pkg5.0_1.6.2_amd64.deb ...
Unpacking libapt-pkg5.0:amd64 (1.6.2) over (1.6.1) ...
Setting up libapt-pkg5.0:amd64 (1.6.2) ...
(Reading database ... 28484 files and directories currently installed.)
Removing ubuntu-minimal (1.417) ...
Removing apt-utils (1.6.1) ...
(Reading database ... 28443 files and directories currently installed.)
Preparing to unpack .../Downloads/apt_1.6.2_amd64.deb ...
Unpacking apt (1.6.2) over (1.6.1) ...
Setting up apt (1.6.2) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for man-db (2.8.3-2) ...
+ apt update -o acquire::http::timeout=1
Err:1 http://archive.ubuntu.com/ubuntu bionic InRelease       
  Could not connect to archive.ubuntu.com:80 (91.189.88.161), connection timed 
out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::21), 
connection timed out Could not connect to archive.ubuntu.com:80 
(91.189.88.149), connection timed out Could not connect to 
archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out Could not 
connect to archive.ubuntu.com:80 (91.189.88.152), connection timed out Could 
not connect to archive.ubuntu.com:80 (2001:67c:1560:8001::14), connection timed 
out Could not connect to archive.ubuntu.com:80 (91.189.88.162), connection 
timed out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::17), 
connection timed out
Err:2 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
  Unable to connect to archive.ubuntu.com:http:
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/bionic/InRelease  
Could not connect to archive.ubuntu.com:80 (91.189.88.161), connection timed 
out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::21), 
connection timed out Could not connect to archive.ubuntu.com:80 
(91.189.88.149), connection timed out Could not connect to 
archive.ubuntu.com:80 (2001:67c:1560:8001::11), connection timed out Could not 
connect to archive.ubuntu.com:80 (91.189.88.152), connection timed out Could 
not connect to archive.ubuntu.com:80 (2001:67c:1560:8001::14), connection timed 
out Could not connect to archive.ubuntu.com:80 (91.189.88.162), connection 
timed out Could not connect to archive.ubuntu.com:80 (2001:67c:1360:8001::17), 
connection timed out
W: Failed to fetch 
http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Unable to 
connect to archive.ubuntu.com:http:
W: Some index files failed to download. They have been ignored, or old ones 
used instead.

real    0m3.130s
user    0m0.105s
sys     0m0.023s


** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
https://bugs.launchpad.net/bugs/1766542

Title:
  Installation blocks when the machine is behind a proxy server

Status in OEM Priority Project:
  Confirmed
Status in apt package in Ubuntu:
  Fix Released
Status in ubiquity package in Ubuntu:
  Incomplete
Status in apt source package in Bionic:
  Fix Committed
Status in ubiquity source package in Bionic:
  New

Bug description:
  [Impact]
  APT takes a long time to notice when certain connections time out

  [Test case]
  * Change the default route to not route stuff successfully (wrong gateway,
    for example)
  * Make your sources.list look like this:

  deb http://archive.ubuntu.com/ubuntu bionic main restricted
  deb http://archive.ubuntu.com/ubuntu bionic-updates main restricted

  * Run apt update

  You should see that it fails with a long verbose error message for the
  first entry, with all possible IP addresses listed in it; while for
  the second one it fails with just "Unable to connect to
  archive.ubuntu.com:http:" as it recognizes it has been blacklisted.

  [Regression potential]
  APT will not attempt to retry the host given that it could not connect to it 
for previous entries. If your network recovered in the meantime, it might 
update less than previously.

  [Original bug report]
  When the machine is behind a proxy server, the installation will block for a 
while (several minutes) to retrieve the package lists. The timeouts are too 
long and makes user feels the machine may have some problems.

  The symptom is similar with bug #14599, but it seems the apt-setup
  module was rewritten.

  Another method to trigger this issue is to make the machine cannot
  access to the Internet, for instance: a wrong gateway.

  Image: 16.04

To manage notifications about this bug go to:
https://bugs.launchpad.net/oem-priority/+bug/1766542/+subscriptions

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