`Pacman` rollback or fixing a disappeared KDE taskbar?

Question

I upgraded my ArchLinux installation yesterday and one of the packages affected was KDE. After restarting, the taskbar has disappeared and I have found no way to make it reappear. Is there a mirror with older packages (to rollback) or a way to fix the problem?

Answer 1

Note that KDE is a group of packages and when upgrading with pacman it would typically upgrade individual packages in that group. Look in /var/log/pacman.log to see exactly which packages that were upgraded.

You should be able to downgrade the package that source your problem there, by locating the previous version of the package in
/var/cache/pacman/pkg/<pkg_name>-<ver>-<arch>.pkg.tar.xz.

From there your simply install the old version with

# pacman -U /var/cache/pacman/pkg/<pkg_name>-<ver>-<arch>.pkg.tar.xz

Answer 2

No idea about fixing the problem, but you'll find lots of information regarding downgrading packages in the ArchWiki's "Downgrading Packages" section; both using possible cached versions and with older packages.

Answer 3

Same problem here. After some time I found this page where appeared to have a similar problem.

After reading it, this was what I did to solve it in my archlinux system:

$ # Backup files 'plasma-desktoprc' and 'plasma-desktop-appletsrc'  
$ find ~ -type f -iname "*plasma-desktop*" -exec cp -v {} {}.old \;  
# reboot

I hope it helps.