Edit 27.5.2026: apt package manager is obsolete, but DNF-package manager is working after running commands
su -c "sed -i 's|/pclinuxos/apt/|/apt/|g' /etc/repo.d/default.repo"
su -c "sed -i 's|/pclinuxos/apt/|/apt/|g' /usr/share/dnf-package-manager/repos/*.repo"
Also addlocale is broken, but it works using a command as root
addlocale --no-updatetest
/etc/repo.d/default.repo file
[kde6]
name="PCLinuxOS KDE 6 Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.kde6
gpgcheck=0
type=rpm-md
enabled=1
[kernel]
name="PCLinuxOS Kernel Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.kernel
gpgcheck=0
type=rpm-md
enabled=0
[mate]
name="PCLinuxOS MATE Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.mate
gpgcheck=0
type=rpm-md
enabled=1
[xfce4]
name="PCLinuxOS XFce4 Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.xfce4
gpgcheck=0
type=rpm-md
enabled=1
[x86_64]
name="PCLinuxOS Main Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.x86_64
gpgcheck=0
type=rpm-md
enabled=1
[test]
name="PCLinuxOS Test Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.test
gpgcheck=0
type=rpm-md
enabled=0
[nvidia340]
name="PCLinuxOS nvidia340 Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.nvidia340
gpgcheck=0
type=rpm-md
enabled=0
[nvidia470]
name="PCLinuxOS nvidia470 Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.nvidia470
gpgcheck=0
type=rpm-md
enabled=0
[nvidia525]
name="PCLinuxOS nvidia525 Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.nvidia525
gpgcheck=0
type=rpm-md
enabled=0
[unstable]
name="PCLinuxOS Unstable Repo"
baseurl=http://ftp.fau.de/pclinuxos/apt/pclinuxos/64bit/RPMS.unstable
gpgcheck=0
type=rpm-md
enabled=0
***************************************
It seems that updates are not working anymore if the installation has made years ago, so the fix is to edit sources.list as
# 64bit package repository URL's, working as of 01/13/2025
#==================================================================
# Please enable only ONE (1) entry, preferably the first one, nluug !!!
#==================================================================
# rpm http://insecure.nluug.nl/pub/os/Linux/distr/pclinuxos/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
# rpm http://ftp.fau.de/pclinuxos/apt/ pclinuxos/64bit x86_64 kde5 xfce4 mate
# rpm http://mirror.math.princeton.edu/pub/pclinuxos/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate # not syncing on this path, not populated on other
# rpm http://pclinuxos.c3sl.ufpr.br/apt/ pclinuxos/64bit x86_64 kde5 xfce4 mate
# rpm http://ftp.cc.uoc.gr/mirrors/linux/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate # not syncing since 30 March 2026
rpm http://distrib-coffee.ipsl.jussieu.fr/pub/linux/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
# rpm http://mirror.internode.on.net/pub/pclinuxos/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate # appears dead
# rpm http://mirror.aarnet.edu.au/pub/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
# rpm http://ftp.jaist.ac.jp/pub/Linux/PCLinuxOS/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
# rpm http://mirrors.uni-ruse.bg/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
# rpm http://pclinuxos.mirror.wearetriple.com/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
# rpm http://mirror.freedif.org/PCLinuxOS/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
# rpm http://mirrors.cicku.me/pclinuxos/apt/ pclinuxos/64bit x86_64 kde6 xfce4 mate
**************************************
And do the next thing also.
cp /usr/lib64/apt/methods/http /usr/lib64/apt/methods/https
The source: https://www.pclinuxos.com/forum/viewtopic.php?p=11205#p11205