升级时有如下错误：
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[ INFO ] - [initramfs]: start to remove conflict rpm in sut.conf
[ INFO ] - [initramfs]: remove PackageKit-glib-1.1.12-3.el8.x86_64
[ INFO ] - [initramfs]: remove createrepo_c-libs-0.17.7-6.el8.x86_64
[ INFO ] - [initramfs]: remove elfutils-libelf-0.188-3.el8.x86_64
[ INFO ] - [initramfs]: start upgrade your system by dnf
[ ERROR ] - [initramfs]: rebuild rpmdb error
[ ERROR ] - [initramfs]: failed to upgrade system.
[ ERROR ] - [x2openEuler-upgrade] - failed to upgrade system
[ ERROR ] - [centos2openEuler]: Upgrade migrate failed
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该问题是由于elfutils-libelf被删除导致rpm无法使用导致的，
处理方法：
- 把备份文件中libelf相关库copy到系统路径下，测试
rpm --help是否正常
cp /.osback/usr/lib64/libelf* /usr/lib64/
- 测试
dnf --help命令，若有报错：
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Traceback (most recent call last):
File “/usr/lib64/python3.6/site-packages/libdnf/error.py”, line 14, in swig_import_helper
return importlib.import_module(mname)
File “/usr/lib64/python3.6/importlib/init.py”, line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “”, line 994, in _gcd_import
File “”, line 971, in _find_and_load
File “”, line 955, in _find_and_load_unlocked
File “”, line 658, in _load_unlocked
File “”, line 571, in module_from_spec
File “”, line 922, in create_module
File “”, line 219, in _call_with_frames_removed
ImportError: libgnutls.so.30: cannot open shared object file: No such file or directory
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则需要把libgnutils相关库copy到系统路径下
cp /.osbak/usr/lib64/libgnutls.so.30* /usr/lib64/
- 查看/etc/yum.repos.d/目录，删处其中非migrate 文件
4.输入命令rpm -e --nodeps xxx重新删除日志中显示的冲突包，若有报错可忽略
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[ INFO ] - [initramfs]: remove PackageKit-glib-1.1.12-3.el8.x86_64
[ INFO ] - [initramfs]: remove createrepo_c-libs-0.17.7-6.el8.x86_64
[ INFO ] - [initramfs]: remove elfutils-libelf-0.188-3.el8.x86_64
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5.点击重试，即可正常升级