Bug#968055: journal uses an unsupported feature, ignoring file

[積丹尼 Dan Jacobson]

Package: systemd
Version: 245.7-1

I never touched any of this.

# journalctl -f
Journal file /var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal uses an unsupported feature, ignoring file.
Use SYSTEMD_LOG_LEVEL=debug journalctl --file=/var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal to see the details.

# SYSTEMD_LOG_LEVEL=debug journalctl --file=/var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal
Journal effective settings seal=no compress=no compress_threshold_bytes=8B
Journal file /var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal has unknown incompatible flags 0xc
Failed to open journal file /var/log/journal/64f9b494837d480e9ecd81ea0cef1551/system at 5cd966d8e5d24653b114e239c300135e-00000000000e3792-0005ac0f7ccf0a84.journal: Protocol not supported
mmap cache statistics: 0 hit, 1 miss
Failed to open files: Protocol not supported

Maybe this was caused by me
downgrading 246-2 to 245.7-1 ?