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 grubby --info=ALL | grep -B1 '^kernel=' ls /boot/vmlinuz* grubby --set-default /boot/vmlinuz-4.18.0-553.45.1.el8_10.x86_64 # 58.1 downgrade 45.1 grubby --default-kernel. # to confirm  reference https://support.flashgrid.io/hc/en-us/articles/21054031806359-Downgrade-kernel-in-RHEL8

1. 選取標題 2. 選擇表格版面配置 3.點選重複標題        參考資料 https://support.microsoft.com/zh-tw/office/%E5%9C%A8%E5%BE%8C%E7%BA%8C%E9%A0%81%E9%9D%A2%E4%B8%8A%E9%87%8D%E8%A4%87%E8%A1%A8%E6%A0%BC%E6%A8%99%E9%A1%8C-2ff677e0-3150-464a-a283-fa52794b4b41