I recently installed the latest version of the KDE Plasma desktop (5.12) on my system, Ubuntu 17.10. I generally like the layout and appearance, but some fonts are pixelated in certain applications. I have tried to log back into the Unity environment, and there is no problems there.
I have searched forums for similar issues, and suggestions seem to be that the fonts are not made for high resolution. The weird part is that some fonts are pixelated, and some not, even when the same fonts are used, so I don't understand what the issue may be.
Examples of this are in TexStudio, where the selected line appears smooth, while the rest looks fuzzy, PDF output is also fuzzy.
The same problem is found in Discover package manager
Any ideas what causes this problem?
[EDIT:] On request I have checked my version of Plasma desktop. This is what I can find:
$ apt-cache policy plasma-desktop plasma-desktop: Installert: 4:5.12.3-0ubuntu1~ubuntu17.10~ppa1 Kandidat: 4:5.12.3-0ubuntu1~ubuntu17.10~ppa1 Versjonstabell: *** 4:5.12.3-0ubuntu1~ubuntu17.10~ppa1 500 500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu artful/main amd64 Packages 100 /var/lib/dpkg/status 4:5.10.5-0ubuntu1 500 500 http://no.archive.ubuntu.com/ubuntu artful/universe amd64 Packages $ which plasmashell /usr/bin/plasmashell $ plasmashell --version plasmashell 5.12.3
KDE was installed according to something like this.