I've tried to upgrade my Pi from Wheezy to Jessie, so that I could get most recent versions of some applications and get the Pi up to date.
To accomplish the upgrade, I read over these sites:
https://www.raspberrypi.org/blog/raspbian-jessie-is-here/
And especially followed these instructions.
I'm brave enough to perform actions like these, but only as I don't have critical data stored there (well, actually I don't want lose any of the webpages and some apache configurations I own there).
Now, I can't install apps through console and nor fully complete the upgrade. See what happens when I type sudo dpkg --configure -a:
jins@raspberrypi /var/www $ sudo dpkg --configure -a
Configurando systemd (215-17+deb8u4) ...
addgroup: El grupo `systemd-journal' ya existe como grupo del sistema. Saliendo.
groupadd: existing lock file /etc/gshadow.lock without a PID
groupadd: no se pudo bloquear /etc/gshadow, inténtelo de nuevo.
adduser: `/usr/sbin/groupadd -g 118 systemd-timesync' devolvió el código de error 10. Saliendo.
dpkg: error al procesar el paquete systemd (--configure):
el subproceso instalado el script post-installation devolvió el código de salida de error 1
Se encontraron errores al procesar:
systemd
Is it possible to give a solution to my problem or do I have to backup my data and do a fresh install?