原因一：
沒有在開機啓動項將secure boot禁用
解決：開機時按del進入，找到security，在裏面找secure boot 並選擇disabled。（tips:進啓動項也有可能是別的鍵）
原因二：
系統使用了新內核。
解決：更換內核。
首先查看系統內核:
uname -r
記住當前版本,然後查看所有內核:
grep menuentry /boot/grub/grub.cfg
選擇舊版本.下面以我爲例:
我的所有內核信息:
ubuntu@ubuntu:~$ grep menuentry /boot/grub/grub.cfg
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
menuentry_id_option=""
export menuentry_id_option
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
submenu 'Advanced options for Ubuntu' $menuentry_id_option 'gnulinux-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-70-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-70-generic-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-70-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-70-generic-init-upstart-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-70-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-70-generic-recovery-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-66-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-66-generic-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-66-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-66-generic-init-upstart-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-66-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-66-generic-recovery-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-64-generic' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-64-generic-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-64-generic (upstart)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-64-generic-init-upstart-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Ubuntu, with Linux 4.15.0-64-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-4.15.0-64-generic-recovery-5b51bd63-24ef-4c07-a6b0-0d95283dec4f' {
menuentry 'Memory test (memtest86+)' {
menuentry 'Memory test (memtest86+, serial console 115200)' {
比如我想更換內核到4.15.0-64, 那麼我需要複製兩條信息:
第一個是跟在Advanced options for Ubuntu後面的id:
gnulinux-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f
第二個是內核版本後面的id(4.15.0-64-generic):
gnulinux-4.15.0-64-generic-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f
確定這兩條內容後我們打開grub文件進行修改:
sudo gedit /etc/default/grub
修改grub文件中的GRUB_DEFAULT=“gnulinux-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f>gnulinux-4.15.0-64-generic-advanced-5b51bd63-24ef-4c07-a6b0-0d95283dec4f”
兩個id中間用>分隔.
保存關閉文件,終端敲
sudo update-grub
最後重啓:
sudo reboot