多次升级之后，系统内就会累计有多个内核版本，可以考虑删除旧的不用的内核。
参考：
https://askubuntu.com/questions/1253347/how-to-easily-remove-old-kernels-in-ubuntu-20-04-lts
vi remove_old_kernels.sh
新建一个文件内容如下：
#!/bin/bash
# Run this script without any param for a dry run
# Run the script with root and with exec param for removing old kernels after checking
# the list printed in the dry run
uname -a
IN_USE=$(uname -a | awk '{ print $3 }')
if [[ $IN_USE == *-generic ]]
then
IN_USE=${IN_USE::-8}
fi
echo "Your in use kernel is $IN_USE"
OLD_KERNELS=$(
dpkg --list |
grep -v "$IN_USE" |
grep -v "linux-headers-generic" |
grep -v "linux-image-generic" |
grep -Ei 'linux-image|linux-headers|linux-modules' |
awk '{ print $2 }'
)
echo "Old Kernels to be removed:"
echo "$OLD_KERNELS"
if [ "$1" == "exec" ]; then
for PACKAGE in $OLD_KERNELS; do
yes | apt purge "$PACKAGE"
done
fi
执行
bash ./remove_old_kernels.sh
看查看到要删除的内核版本和相关的包，确认没有问题之后再通过
sudo bash ./remove_old_kernels.sh exec
进行实际删除。
之后重启，再检查现有的内核是否符合预期。