Here's the output:
teuthworker@kvm06:~$ worker_start magna 1
magna 1
Starting 1 workers for magna
teuthworker@kvm06:~$ 2020-05-05 12:55:15,686.686 INFO:root:teuthology version: 1.0.0-58684fc5
2020-05-05 12:55:15,700.700 INFO:teuthology.repo_utils:Fetching master from origin
2020-05-05 12:55:17,404.404 INFO:teuthology.repo_utils:Resetting repo at /home/teuthworker/src/github.com_ceph_teuthology_master to branch origin/master
2020-05-05 12:55:17,412.412 INFO:teuthology.repo_utils:Bootstrapping /home/teuthworker/src/github.com_ceph_teuthology_master
2020-05-05 12:55:17,575.575 INFO:teuthology.repo_utils:Bootstrap exited with status 1
2020-05-05 12:55:17,575.575 WARNING:teuthology.repo_utils:dpkg-query:
2020-05-05 12:55:17,575.575 WARNING:teuthology.repo_utils:package
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:'python-pip'
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:is
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:not
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:installed
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:and
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:no
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:information
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:is
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:available
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:Use
2020-05-05 12:55:17,576.576 WARNING:teuthology.repo_utils:dpkg
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:--info
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:(=
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:dpkg-deb
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:--info)
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:to
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:examine
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:archive
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:files.
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:./bootstrap:
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:missing
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:required
2020-05-05 12:55:17,577.577 WARNING:teuthology.repo_utils:packages:
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:python-pip
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:Please
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:install
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:missing
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:packages
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:or
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:run
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:'./bootstrap
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:install'
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:if
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:you
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:have
2020-05-05 12:55:17,578.578 WARNING:teuthology.repo_utils:sudo
2020-05-05 12:55:17,579.579 WARNING:teuthology.repo_utils:sudo
2020-05-05 12:55:17,579.579 WARNING:teuthology.repo_utils:apt-get
2020-05-05 12:55:17,579.579 WARNING:teuthology.repo_utils:-y
2020-05-05 12:55:17,579.579 WARNING:teuthology.repo_utils:install
2020-05-05 12:55:17,579.579 WARNING:teuthology.repo_utils:python-pip
2020-05-05 12:55:17,579.579 INFO:teuthology.repo_utils:Removing /home/teuthworker/src/github.com_ceph_teuthology_master/virtualenv
2020-05-05 12:55:17,579.579 ERROR:teuthology.repo_utils:Bootstrap error encountered; retrying
Traceback (most recent call last):
File "/home/teuthworker/src/teuthology_master/teuthology/repo_utils.py", line 331, in fetch_repo
bootstrap(dest_path)
File "/home/teuthworker/src/teuthology_master/teuthology/repo_utils.py", line 423, in bootstrap_teuthology
raise BootstrapError("Bootstrap failed!")
BootstrapError: Bootstrap failed!