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The version of Roundcube I am using is 0.9.5+dfsg1-4.1

Well there's your problem.
Upgrade Roundcube, or add the code to use imap_conn_options to your 
current version.

http://lists.roundcube.net/pipermail/svn/2014-September/012195.html
   Add config option to specify IMAP connection socket parameters - 
imap_conn_options (#1489948)


On 2016-06-18 15:27, Maurizio Dall'Acqua wrote:
> The version of Roundcube I am using is 0.9.5+dfsg1-4.1

On 06/18/2016 02:27 AM, Maurizio Dall'Acqua wrote:
> The version of Roundcube I am using is 0.9.5+dfsg1-4.1
If you want to get a newer version using Debian packages, perhaps try to add the
following line to /etc/apt/sources.list :

deb http://httpredir.debian.org/debian jessie-backports main

Then run:

apt-get --dry-run -tjessie-backports install roundcube

and take a close look at what's being pulled from where, make sure it all
makes sense to you.

Then run it again, for real:

apt-get -tjessie-backports install roundcube

This should get you roundcube 1.1.5+dfsg.1-1~bpo8+1 from Debian's
repository, while pulling necessary dependencies from your native raspbian.

I've tried to install the new version of Roundcube but I've got an error
message:               


Unpacking roundcube (1.1.5+dfsg.1-1~bpo8+1) ...
Errors were encountered while processing:
 /var/cache/apt/archives/roundcube-core_1.1.5+dfsg.1-1~bpo8+1_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

If anybody can give me instructions on how to correct this, perhaps I should
try to downgrade again?



On Sat, Jun 18, 2016 at 06:37:33AM -0400, Gedalya wrote:
> On 06/18/2016 02:27 AM, Maurizio Dall'Acqua wrote:
> > The version of Roundcube I am using is 0.9.5+dfsg1-4.1
> 
> If you want to get a newer version using Debian packages, perhaps try to
add the following line to /etc/apt/sources.list :
> 
> deb http://httpredir.debian.org/debian jessie-backports main
> 
> Then run:
> 
> apt-get --dry-run -tjessie-backports install roundcube
> 
> and take a close look at what's being pulled from where, make sure it
all makes sense to you.
> 
> Then run it again, for real:
> 
> apt-get -tjessie-backports install roundcube
> 
> This should get you roundcube 1.1.5+dfsg.1-1~bpo8+1 from Debian's
repository, while pulling necessary dependencies from your native raspbian.