I enabled the compose key (Right Alt) option in gnome-tweaks it worked fine, after a restart it was not working, I went again to the gnome-tweaks, it was disabled, I tried to re-enable it but it was not working either, then I decided to disable it and search for another solution, after being disabled it started to work. Now, the compose key works when its option is disabled in the gnome-tweaks app and does not work when its option is enabled.
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ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2018-08-14 (9 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
Package: gnome-tweaks 3.28.1-1
PackageArchitecture: all
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=ro_RO.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Tags: bionic
Uname: Linux 4.15.0-33-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
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