** Description changed:

  ==== Begin SRU Template ========
  [Impact]
  Curtin installation can be configured to install additional apt
  repositories and import gpg keys from a remote keyserver by fingerprint.
  'gpg --recv' can transiently fail, causing installation failure.
  
  The fix is to just retry
    gpg --keyserver keyserver.ubuntu.com --recv <key>
  
  [Test Case]
  Run curtin vmtest on XenialTestAptSrcDisablePockets
   ./tools/jenkins-runner tests/vmtests/test_apt_source.py
  
  The named test pushes curtin through use of gpg --keyserver.
  It does not guarantee failure and re-try, but does test the
  happy path.  Even if the gpg server was available on the first
  time, we at very least then verify that there is no regression.
  
  [Regression Potential]
  Low risk of regression.  The code change is just to sleep and retry
  a command if it failed.
+ 
+ [Other Info]
+ When looking further into some failures in add-apt-repository that were
+ not fixed by re-trying, we found bug 1532855 .  It is not explicitly
+ related to this bug, but is a similar failure path.
  
  ==== End   SRU Template ========
  
  In some cases we have transient network failure while attempting to recv
  gpg keys when configuring apt.
  
  https://jenkins.ubuntu.com/server/job/curtin-
  vmtest/737/artifact/output/XenialTestAptSrcDisablePockets/logs/install-
  serial.log
  
  [   40.161264] cloud-init[1528]: Command: ['gpg', '--keyserver', 
'keyserver.ubuntu.com', '--recv', '0E72 9061 0D2F 6DC4 D65E  A921 9A31 4EC5 
F470 A0AC']
  [   40.162213] cloud-init[1528]: Exit code: 2
  [   40.163711] cloud-init[1528]: Reason: -
  [   40.164256] cloud-init[1528]: Stdout: "gpgkeys: key 
0E7290610D2F6DC4D65EA9219A314EC5F470A0AC can't be retrieved\n"
  [   40.174200] cloud-init[1528]: Stderr: 'gpg: requesting key F470A0AC from 
hkp server keyserver.ubuntu.com\ngpg: no valid OpenPGP data found.\ngpg: Total 
number processed: 0\ngpg: keyserver communications error: keyserver helper 
general error\ngpg: keyserver communications error: unknown pubkey 
algorithm\ngpg: keyserver receive failed: unknown pubkey algorithm\n'
  [   40.180654] cloud-init[1528]: During handling of the above exception, 
another exception occurred:
  [   40.182056] cloud-init[1528]: Traceback (most recent call last):
  [   40.183644] cloud-init[1528]:   File "/curtin/curtin/gpg.py", line 65, in 
getkeybyid
  [   40.185067] cloud-init[1528]:     recv_key(keyid, keyserver=keyserver)
  [   40.186653] cloud-init[1528]:   File "/curtin/curtin/gpg.py", line 48, in 
recv_key
  [   40.187895] cloud-init[1528]:     (key, keyserver, error))
  
  Curtin should retry this command.

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https://bugs.launchpad.net/bugs/1661337

Title:
  curtin does not retry when gpg fails to recv key

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