Comment 1 for bug 1643805

I see no attachment...

Please select "Copy to clipboard" when the error message shows up, and
paste it here directly.

Submitting error messages in a text file or word document requires
invoking external programs just to read, and word documents are beyond
ugly and vastly unnecessary for this purpose. Using a screenshot of the
message is possibly the least accurate and most unreadable way of
passing along TEXTUAL INFO that mankind has invented, but people do it
depressingly often.

In other words, please don't use attachments for error messages.

...

Also, Ubuntu 16.10 currently ships calibre 2.60.0 in their repositories,
but the latest version of calibre is v2.72.0 so can you please confirm
whether you simply haven't upgraded in a few weeks or whether you are
using the distro package?

Using the distro package is a common source of problems, and if the
problem cannot be duplicated with the official binary releases on
calibre's website, then it is a distro packaging bug and you should ask
the Ubuntu packagers for help.

If you simply haven't upgraded in a few weeks, then 1) interesting
coincidence :D and 2) try upgrading to the latest version of calibre
anyway, to make sure it is still a problem.

 status incomplete