Can't upgrade LyX on Focal Fossa

[Jean-Marc Lasgouttes]

Le 22/07/2020 à 19:27, Liviu Andronic a écrit :
> On 7/22/20, Kees Zeelenberg <kzstatis at gmail.com> wrote:
>> Thanks for compiling. Synaptic (on Linux Mint 20) aborts installing
>> LyX from the PPA with the messages:
>> Vereisten: libqtcore4 (>=4:4.8.0) but it is not installable
>> Vereisten: libqtgui4 (>=4:4.8.0) but it is not installable
>> Vereisten: libqt4-svg  but it is not installable
>>
>> It seems Qt4 is no longer supplied on Focal.
>>
> Yes, for Ubuntu Focal, Qt4 was removed from the Ubuntu repositories.
> To install LyX, you will also need to add the ppa:rock-core/qt4 PPA to
> your sources (https://launchpad.net/~rock-core/+archive/ubuntu/qt4).

Liviu, I would advise to configure with --enable-qt5 (will be the defalt 
in 2.4.0) for recent versions. It almost works with 16.04 (actually it 
works but outputs annoying messages on console) and actually works with 
later versions, AFAIK.

JMarc