今天早上我安装了 Ubuntu Gnome 15.04。我安装了一些应用程序，并重启了几次电脑，没有出现任何问题。但我刚刚运行了更新，更新完成后我重启电脑时，电脑在启动画面上卡住了，三个点都填满了。
Ctrl+Shift+Num 键没有任何作用，与 Ctrl+Alt+Del 相同。
唯一能让电脑运行的方法就是按下电源按钮。屏幕会闪烁启动时的输出文本。我看到的最后两件事是：
Starting GNOME Display Manager
gdm.service
文本闪烁，然后返回启动画面，不再冻结，然后计算机关闭。我能够从用于安装 Ubuntu 的 Linux USB 驱动器启动，但不确定要查看哪些日志或如何继续。
更新：找到了 boot.log 文件，这些是最后几个条目：
[[32m OK [0m] Started Restore Sound Card State.
[[32m OK [0m] Started Permit User Sessions.
[[32m OK [0m] Started LSB: Set the CPU Frequency Scaling governor to "ondemand".
[[32m OK [0m] Started LSB: Speech Dispatcher.
[[32m OK [0m] Started Restore /etc/resolv.conf if the system crashed before the ppp link was shut down..
[[32m OK [0m] Started Console System Startup Logging.
[[32m OK [0m] Started Ubuntu live CD installer.
[[32m OK [0m] Started LSB: daemon to balance interrupts for SMP systems.
[[32m OK [0m] Started D-Bus System Message Bus.
[[32m OK [0m] Started Avahi mDNS/DNS-SD Stack.
[[32m OK [0m] Started Bluetooth service.
[[32m OK [0m] Started LSB: automatic crash report generation.
[[32m OK [0m] Started LSB: Record successful boot for GRUB.
[[32m OK [0m] Started System Logging Service.
[[32m OK [0m] Reached target Bluetooth.
[[32m OK [0m] Started Make remote CUPS printers available locally.
Starting Make remote CUPS printers available locally...
[[32m OK [0m] Started Login Service.
Starting Authenticate and Authorize Users to Run Privileged Tasks...
[[32m OK [0m] Started Authenticate and Authorize Users to Run Privileged Tasks.
[[32m OK [0m] Started Accounts Service.
[[32m OK [0m] Started Modem Manager.
[[32m OK [0m] Started Network Manager.
[[32m OK [0m] Reached target Network.
Starting /etc/rc.local Compatibility...
Starting MySQL Community Server...
Starting Network Manager Wait Online...
[[32m OK [0m] Started /etc/rc.local Compatibility.
Starting Wait for Plymouth Boot Screen to Quit...
Starting WPA supplicant...
[[32m OK [0m] Started WPA supplicant.
[[32m OK [0m] Started Detect the available GPUs and deal with any system changes.
Starting GNOME Display Manager...
[[32m OK [0m] Started GNOME Display Manager.
如果我以恢复模式启动，它会给我恢复选项，我选择继续启动。我收到一条消息，说恢复启动后某些显示管理器无法工作，可能需要重新启动。我说继续，然后它冻结在一个空白屏幕上。我按了一次电源按钮，它闪烁到带有登录提示的终端，然后重新启动。我也尝试过进入恢复模式并修复软件包，但没有成功。
答案1
可能和这个错误有关？
https://bugs.launchpad.net/ubuntu-gnome/+bug/1460045
升级到 Gnome 3.16 后，我遇到了 Ubuntu Gnome 15.04 的问题（在 3.14 版本中我的笔记本电脑运行正常）。
希望能帮助到你