1、/etc/os-release里面的id改成 redhat,也就是 /boot/efi/EFI/下面的redhat目录对应就行
2、修改下面文件
vim /etc/yum/pluginconf.d/subscription-manager.conf
....
enbaled=0
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解决如下报错问题
[ ERROR ] - [x2openEuler-upgrade] - [Check]: failed to check boot_loader file
[ INFO ] - [x2openEuler-upgrade] - [Check]: complete getting root available space
[ WARNING ] - [x2openEuler-upgrade] - [Check]: /etc/hosts.allow or /etc/hosts.deny was changed, please handle them after upgrade
[ INFO ] - [x2openEuler-upgrade] - [Check]: complete checking fstab file
[ ERROR ] - [x2openEuler-upgrade] - [Check]: failed to found grub.cfg in your system