can't install nautilus-dropbox: GpgmeError: Invalid crypto engine

[Adam Dingle]

I'm running the daily build of Ubuntu 13.10 (Saucy).

When I try to install nautilus-dropbox, I get a Python error

  gpgme.GpgmeError: (7, 150, u'Invalid crypto engine')

The full trace is below.

$ sudo apt-get install nautilus-dropbox
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  linux-image-generic
Use 'apt-get autoremove' to remove it.
The following NEW packages will be installed:
  nautilus-dropbox
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/94.5 kB of archives.
After this operation, 376 kB of additional disk space will be used.
Selecting previously unselected package nautilus-dropbox.
(Reading database ... 158616 files and directories currently installed.)
Unpacking nautilus-dropbox (from .../nautilus-dropbox_1.4.0-3_amd64.deb) ...
Processing triggers for man-db ...
Processing triggers for gnome-menus ...
Processing triggers for desktop-file-utils ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for mime-support ...
Processing triggers for hicolor-icon-theme ...
Setting up nautilus-dropbox (1.4.0-3) ...

Dropbox is the easiest way to share and store your files online. Want to learn more? Head to http://www.dropbox.com/

Downloading Dropbox... 100%
Traceback (most recent call last):
  File "/usr/bin/dropbox", line 1404, in <module>
    ret = main(sys.argv)
  File "/usr/bin/dropbox", line 1393, in main
    result = commands[argv[i]](argv[i+1:])
  File "/usr/bin/dropbox", line 817, in update
    download()
  File "/usr/bin/dropbox", line 556, in download
    name, i, total = one_member.next()
  File "/usr/bin/dropbox", line 278, in unpack
    if not verify_signature(StringIO.StringIO(DROPBOX_PUBLIC_KEY), signature, self.local_file):
  File "/usr/bin/dropbox", line 200, in verify_signature
    with gpgme_context([key_file]) as ctx:
  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()
  File "/usr/bin/dropbox", line 188, in gpgme_context
    result = ctx.import_(key_file)
gpgme.GpgmeError: (7, 150, u'Invalid crypto engine')
Please restart all running instances of Nautilus, or you will experience problems. i.e. nautilus --quit
Dropbox installation successfully completed! You can start Dropbox from your applications menu.
$

[Andreas Olsson (andol)]

Just experienced this myself, on my recently reinstalled Ubuntu 13.10 amd64 system. When I then tried the Dropbox package from the Dropbox website, of verison 1.6.0, I'm getting exact python-gpgme error on trying to verify the downloaded binary.

Possibly that this might be a python-gpgme bug instead, or that the Dropbox people have changed their download binary in some fashion.

[Andreas Olsson (andol)]

...except that both Ubuntu 13.04 and Ubuntu 13.10 uses python-gpgme 0.3-0ubuntu1 0

Instead I took at look at libgpgme11.

Downgrading libgpgme11 from the current Ubuntu 13.10 version 1.4.2-0.1ubuntu2 to the Ubuntu 13.04 verison 1.2.0-1.4ubuntu4 did the trick, and allowed Dropbox to verify its downloaded binary without complaining.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[supaiku (supaiku-ppa)]

Still not fixed.

[[e-mail] (kaotiks)]

I just force downgraded libgpgme to the Raring version and now I have it installed just fine.

Just did a quick `sudo apt-get install libgpgme11=1.2.0-1.4ubuntu4 --force-yes` and that was all it took. Mind you, in my case I had to reload the raring repos because it couldn't find the version in the saucy repos, but that is a quick suorces.list edit and update.

Juat thought I would share my experience. Not a fix, but a temporary workaround.

[Raphaël Hertzog (hertzog)]

Debian Unstable has libgpgme11 1.4.2-0.1 and I can't reproduce the problem. So this is somewhat Ubuntu specific. But the Ubuntu specific changes on gpgme1.0 are mainly tweaked dependencies so it would be a bit weird to have an entirely different behaviour just because of this.

Can you try in with libgpgme11 1.4.2-0.1ubuntu2 and with gnupg2 installed ?

[Martin Pitt (pitti)]

This is fallout from https://launchpad.net/ubuntu/+source/gpgme1.0/1.4.2-0.1ubuntu2, it gets built against gnupg2. This can also be seen from starting seahorse.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gpgme1.0 - 1.4.2-0.1ubuntu3

---------------
gpgme1.0 (1.4.2-0.1ubuntu3) saucy; urgency=low

  * debian/rules: Switch back to using /usr/bin/gpg and add back gnupg build
    dependency, as we don't install gnupg2 by default. This was missing in the
    previous upload, and unbreaks nautilus-dropbox, seahorse, bzr, and other
    libgpgme consumers. (LP: #1196253)
 -- Martin Pitt <email address hidden> Tue, 30 Jul 2013 10:34:24 +0200

[KARTHIK (kannankarthik1992)]

Currently using libgpgme11 - 1.4.2-0.1ubuntu3 in Ubuntu saucy.

Still facing the same problem when trying to install dropbox.

Downloading Dropbox... 100%
Traceback (most recent call last):
  File "/usr/bin/dropbox", line 1404, in <module>
    ret = main(sys.argv)
  File "/usr/bin/dropbox", line 1393, in main
    result = commands[argv[i]](argv[i+1:])
  File "/usr/bin/dropbox", line 817, in update
    download()
  File "/usr/bin/dropbox", line 556, in download
    name, i, total = one_member.next()
  File "/usr/bin/dropbox", line 278, in unpack
    if not verify_signature(StringIO.StringIO(DROPBOX_PUBLIC_KEY), signature, self.local_file):
  File "/usr/bin/dropbox", line 201, in verify_signature
    sigs = ctx.verify(sig_file, plain_file, None)
gpgme.GpgmeError: (7, 58, u'No data')
The installation of Dropbox failed.

Tried downgrading to 1.2.0-1.4ubuntu4 as suggested in one of the comments, but that too didn't solve the problem. Got the same above error with the older version also.