====== Linux Troubleshooting ======
| [[forceunmountnfs|Force unmount a broken NFS mount]]                                                                                                                         | ''umount -fl /mnt/nfsmount'' \\ ''%%umount --force --lazy /mnt/nfsmount%%''                                                                                                     |
| hard reset when ''reboot'' doesn't work                                                                                                                                      | ''echo 1 > /proc/sys/kernel/sysrq'' \\ ''echo b > /proc/sysrq-trigger''                                                                                                         |
| force luksClose when "Device is still in use"                                                                                                                                | ''dmsetup remove -f //luksName//''                                                                                                                                              |
| while upgrading, this message appears: \\ ''/usr/bin/perl: error while loading shared libraries: libcrypt.so.1: cannot open shared object file: No such file or directory''  | ''apt download libcrypt1'' \\ ''dpkg-deb -x libcrypt1_1%3a4.4.33-2_arm64.deb .'' \\ ''cp -av lib/aarch64-linux-gnu/* /lib/aarch64-linux-gnu/'' \\ ''apt --fix-broken install''  |
| Keep journals for only //n// days                                                                                                                                            | ''vim /etc/systemd/journald.conf'' <code ini>MaxRetentionSec=7day</code>   \\ ''systemctl restart systemd-jornald''                                                             |
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