我有一个问题，我找不到如何解决它，所以如果有人能帮我一把，我将不胜感激。
将我的一个 proxmox vm 升级到 debian 8 jessie 后一切正常，但是当我重新启动 vm 时，它无法加载。我通过 Proxmox 的 VNC 连接并在启动时显示此内容，但我无法键入或执行任何操作。
systemd 215 running in system mode. (+PAM +AUDIT +SELINUX +IMA +SYSVININT +LIBCRYPTSETUP +GCRYPT +ACL +XZ -SECCOMP -APPARMOR)
Detected virtualization 'openvz'.
Detected architecture 'x86-64'.
Welcome to Debian GNU/Linux 8 (jessie)!
Sethostname to <srv4>.
Failed to enable kbrequest handling: Invalid argument
Cannot add dependency job for unit rpcbind.service, ignoring: Unit rpcbind.service failed to load: No such file or directory.
Cannot add dependency job for unit display-manger.service, ignoring: Unit display-manager.service failed to load: No such file or directory.
Assertion 'clock_gettime(clock_id, &ts) == 0' failed at ../srv/shared/time-util.c:33, function no(). Aborting.
Caught <ABRT>, dumped core as pid 53.
Freezing execution.
有人知道发生了什么吗？
谢谢你的支持。