Undefined symbol name boto prevents backups to S3

[Manuel J.]

The following error is produced, when attempting to run a backup to S3.
This bug blocks backups completely.

---
Traceback (innermost last):
  File "/snap/deja-dup/178/bin/duplicity", line 1706, in <module>
    with_tempdir(main)
  File "/snap/deja-dup/178/bin/duplicity", line 1692, in with_tempdir
    fn()
  File "/snap/deja-dup/178/bin/duplicity", line 1525, in main
    action = commandline.ProcessCommandLine(sys.argv[1:])
  File "/snap/deja-dup/178/lib/python3.6/site-packages/duplicity/commandline.py", line 1189, in ProcessCommandLine
    globals.backend = backend.get_backend(args[0])
  File "/snap/deja-dup/178/lib/python3.6/site-packages/duplicity/backend.py", line 228, in get_backend
    obj = get_backend_object(url_string)
  File "/snap/deja-dup/178/lib/python3.6/site-packages/duplicity/backend.py", line 214, in get_backend_object
    return factory(pu)
  File "/snap/deja-dup/178/lib/python3.6/site-packages/duplicity/backends/_boto_single.py", line 173, in __init__
    self.resetConnection()
  File "/snap/deja-dup/178/lib/python3.6/site-packages/duplicity/backends/_boto_single.py", line 193, in resetConnection
    self.storage_uri = boto.storage_uri(self.boto_uri_str)
 NameError: name 'boto' is not defined
---

Duplicity version 0.8.00
Deja-Dup version: 40.1 (via snap)
Python version: 3.6
OS: Ubuntu 18.04
Filesystem: Linux

[Michael Terry (mterry)]

The deja-dup snap now includes a patch for this.

[Manuel J. (maennel)]

Thank you @mterry for updating the snap so quickly and proposing a patch to Duplicity.
Much appreciated!