After finding that almost a half (1.9GB) of my Ångström system storage capacity was being filled in /var/log/journal I made some things:
1. Deleted all content in the /var/log/journal folder (but not the folder itself).
2. Edited /etc/systemd/journald.conf (at the beginning all lines were commented) letting SystemMaxUse=16M
3. As the system has limited storage space, I went further and searched how to disable the journald service. I found that masking it (systemctl mask systemd-journald.service) should be better than disabling it (systemctl disable systemd-journald.service)
After this, the system does not boot any more. The boot message is the following:
By enter to System Maintenance Mode, I have tried some things for fixing the system:
If i try to unmask the service (systemctl unmask systemd-journald.service) the message shown is "Failed to issue method call: Read-only file system"
If I try to disable the service (systemctl disable systemd-journald.service) there is not message generated, as if the command would be executed successfully.
If I try to enable the service (systemctl enable systemd-journald.service) the follow message is shown
I hope that someone could give me some advice to get my system working again.