tlsv1 alert unknown ca: SSL alert number 48

[Maurizio Dall'Acqua]

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.