Snap packages of KDE apps don't work on RHEL 7 SUMMARY The snap package of cantor doesn't work at all on RHEL 7.7. CentOS 7 is affected. Fedora 30 is not affected. I believe that this issue may be related to snapd rather than the cantor package itself, because it applies to kolourpaint and okular as well. Since EPEL7 provides exactly the same version of snapd as Fedora does, this bug may be related to one of the snapd deps, e.g. squashfuse or squashfs.ko. https://src.fedoraproject.org/rpms/snapd/blob/ebb6864d0a079930cfd014948ac7dbfc0b1eba2d/f/snapd.spec#_105-113 STEPS TO REPRODUCE 1. Install the latest version of snapd from the EPEL7 testing repo (tried the latest stable version of snapd from EPEL7 as well): yum --disableplugin='priorities' --enablerepo='epel*' install snap-confine snapd snapd-selinux 2. Enable snapd service: sudo systemctl enable snapd.service 3. Start snapd service: sudo systemctl start snapd.service 4. Create a symlink: sudo ln -s "/var/lib/snapd/snap" "/snap" 5. Install Snap Store: sudo snap install snap-store 6. Install cantor (any version: stable 19.08.0, candidate 19.08.3, beta 17.04.3, edge master+97ffb4e) on RHEL 7.7 via Snap Store or just type: sudo snap install cantor 7. Run "cantor" or "/var/lib/snapd/snap/bin/cantor" OBSERVED RESULT $ cantor cantor: error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory $ /var/lib/snapd/snap/bin/cantor cantor: error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory $ /snap/bin/cantor cantor: error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory $ snap run cantor cantor: error while loading shared libraries: libQt5Core.so.5: cannot open shared object file: No such file or directory Please note that the snap package of Qalculate works without any problem. However, other KDE apps (such as KolourPaint or Okular) are affected. EXPECTED RESULT Working application. SOFTWARE/OS VERSIONS Windows: N/A macOS: N/A Linux/KDE Plasma: RHEL 7.7/Linux 3.10.0-1062.9.1.el7.x86_64/snapd: 2.43.3/kde-frameworks-5-core18:kde-frameworks-5-core18-slot (available in About System) KDE Plasma Version: N/A KDE Frameworks Version: N/A Qt Version: N/A ADDITIONAL INFORMATION EL7 $ rpm -q --qf "%{NAME}: %{VERSION}\n" snap-confine snapd snapd-selinux snap-confine: 2.43.3 snapd: 2.43.3 snapd-selinux: 2.43.3 $ which cantor /var/lib/snapd/snap/bin/cantor $ snap connections cantor Interface Plug Slot Notes content[kde-frameworks-5-core18-all] cantor:kde-frameworks-5-plug kde-frameworks-5-core18:kde-frameworks-5-core18-slot - dbus - cantor:session-dbus-interface - desktop cantor:desktop :desktop - desktop-legacy cantor:desktop-legacy :desktop-legacy - home cantor:home :home - network cantor:network :network - network-bind cantor:network-bind :network-bind - opengl cantor:opengl :opengl - pulseaudio cantor:pulseaudio :pulseaudio - unity7 cantor:unity7 :unity7 - x11 cantor:x11 :x11 - $ find /var/lib/snapd/snap/kde-frameworks-5-core18 -xtype f -iname 'libQt5Core.so.5*' 2>/dev/null /var/lib/snapd/snap/kde-frameworks-5-core18/30/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 /var/lib/snapd/snap/kde-frameworks-5-core18/30/usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12 /var/lib/snapd/snap/kde-frameworks-5-core18/30/usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12.3 /var/lib/snapd/snap/kde-frameworks-5-core18/32/usr/lib/x86_64-linux-gnu/libQt5Core.so.5 /var/lib/snapd/snap/kde-frameworks-5-core18/32/usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12 /var/lib/snapd/snap/kde-frameworks-5-core18/32/usr/lib/x86_64-linux-gnu/libQt5Core.so.5.12.3 $ snap info cantor name: cantor summary: KDE Frontend to Mathematical Software publisher: KDEβ store-url: https://snapcraft.io/cantor contact: https://bugs.kde.org/enter_bug.cgi?product=neon&component=Snaps license: unset description: | Cantor is a front-end to powerful mathematics and statistics packages. Cantor integrates them into the KDE Platform and provides a nice, worksheet-based, graphical user interface. It supports environments for KAlgebra, Lua, Maxima, R, Sage, Octave, Python, Scilab, and Qalculate! commands: - cantor snap-id: VCjprGsSZiPuV3CmQViE4TvPMKTOlaiL tracking: latest/stable refresh-date: today at 12:37 CET channels: stable: 19.08.0 2019-08-15 (48) 161MB - candidate: 19.08.3 2019-11-06 (55) 161MB - beta: 17.04.3 2017-08-17 (1) 16MB - edge: master+97ffb4e 2019-07-10 (47) 160MB - installed: 19.08.0 (48) 161MB - $ snap version snap 2.43.3-1.el7 snapd 2.43.3-1.el7 series 16 rhel 7.7 kernel 3.10.0-1062.9.1.el7.x86_64 $ grep -H '^VERSION' /etc/*release* 2>/dev/null /etc/os-release:VERSION="7.7 (Maipo)" /etc/os-release:VERSION_ID="7.7" See also: https://bugs.kde.org/show_bug.cgi?id=417791 https://bugs.launchpad.net/snapd/+bug/1863642
After a deeper analysis, I came to the conclusion that KDE (kde-frameworks-5-core18:kde-frameworks-5-core18-slot) is the problem here. Qt5 (libQt5Core.so.5) was probably built with getentropy, so it requires Linux 3.17, and EL7 uses Linux 3.10 by default. This is why it doesn't work. Anyway, rebuilding KDE without getentropy should solve this problem. https://bugs.kde.org/show_bug.cgi?id=417791#c7