Sorry, dist-upgrade from 14.04 to 16.04 is supported in Plesk Onyx -
https://docs.plesk.com/en-US/17.0/a...ver-administration/distupgrade-support.74627/
So, you can use it in your case.
@IgorG,
It is supported, but the whole process is not reliable: dist-upgrade will cause many issues, with Ubuntu and Plesk.
Note that there are many options to upgrade Ubuntu (depending on the version), being (from the top of my head)
a) in version 14.04.x LTS, with: apt-get dist-upgrade
b) in version 14.04.x LTS, with: apt full-upgrade
c) in latest (but not all) versions of Ubuntu 14.04.x LTS, with: apt-get do-release-upgrade
d) in version 15.10, with the options mentioned in point a), b) and c)
e) in version 15.10, with: apt-get do-release-upgrade
and, at least in most cases, the proper method to upgrade Ubuntu is to use option a), irregardless of the version of Ubuntu.
Note there are some limitations, since the "smart resolution system" of the dist-upgrade command is relying on the contents of the file /etc/apt/sources.list.
For instance, if you are
- running a VPS or a dedicated machine, the dist-upgrade command can have no effect, if the ISP does not support Ubuntu 16.04.1 LTS
- using a custom set of repositories, the dist-upgrade command can result in an unpredictable outcome
and so on.
Note the
most important part: Ubuntu and Plesk are recommending the do-release-upgrade command (see point c)), as follows from
-
https://docs.plesk.com/en-US/17.0/a...ver-administration/distupgrade-support.74627/
-
https://help.ubuntu.com/lts/serverguide/installing-upgrading.html
but the following applies: your Plesk 12.5.30 (on an Ubuntu 16.04.1 LTS, after upgrading) can become a little bit cumbersome (depending on the original Plesk environment AND the degree in which the upgrade has been successful), implying that an upgrade from Plesk 12.5.30 to Onyx (17.0.17) can become a little bit troublesome.
The latter part is a danger that is always present, but the chance on problems decreases when using the apt-get dist-upgrade command.
This has a little bit of history: the do-release-upgrade command, as introduced in Ubuntu 15.10 (a intermediate step towards Ubuntu 16.04.1 LTS, hence the new command), has been backported to Ubuntu 14.04.x LTS (a backport with some trouble and bugs though, with most bugs being resolved at this moment).
Anyway, if and whenever possible,
first try to create a new and fresh Plesk Onyx instance and migrate the data from the (old) Plesk 12.5.30 server.
Hope the above helps a bit.
Regards.....