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You can check how many previous boots are recorded using:
journalctl --list-boots
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journalctl -b → Shows logs from the current boot
journalctl -b -1 → Shows logs from the previous boot (last boot before the reboot)
journalctl -b -2 → Shows logs from the boot before the last one, and so on
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To check kernel issues in last boot:journalctl -b -k -1
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