[Koha] Upgrade to Koha 18.11 on Ubuntu 16.04

[user233162]

Hi,

I have instance of Koha 17.11.05 installed on an Ubuntu
16.04 LTS. I would like to upgrade Koha to the current
version 18.11., but I get the error: 

sudo apt-get install koha-common

Reading package lists... Done
Building dependency tree
Reading state information... Done
koha-common is already the newest version (17.11.05-1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Any idea how resolve this problem please?

Many thanks,

Karel Matějka



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