昨天软件商店提示有更新，于是下载升级，今天发现图形界面出了问题。

现象是启动过程内核加载顺利，来到图形化界面的用户登录页面，本应该输入用户名和口令的文本框未能显示出来，只有一张背景图和鼠标。

上一段日志
Feb 27 10:33:05 line-pc kernel: [   43.776970] thinkpad_acpi: EC reports that Thermal Table has changed
Feb 27 10:33:05 line-pc kernel: [   43.778172] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
Feb 27 10:33:05 line-pc kernel: [   43.778202] radeon 0000:01:00.0: WB enabled
Feb 27 10:33:05 line-pc kernel: [   43.778207] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr 0x0000000010000c00 and cpu addr 0xf112dc00
Feb 27 10:33:05 line-pc kernel: [   43.778209] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr 0x0000000010000c0c and cpu addr 0xf112dc0c
Feb 27 10:33:06 line-pc kernel: [   43.809438] [drm] ring test on 0 succeeded in 0 usecs
Feb 27 10:33:06 line-pc kernel: [   43.809497] [drm] ring test on 3 succeeded in 1 usecs
Feb 27 10:33:06 line-pc kernel: [   43.809500] [drm] Enabling audio 0 support
Feb 27 10:33:06 line-pc kernel: [   43.809518] [drm] ib test on ring 0 succeeded in 0 usecs
Feb 27 10:33:06 line-pc kernel: [   43.809535] [drm] ib test on ring 3 succeeded in 1 usecs
Feb 27 10:33:11 line-pc kernel: [   48.812074] [drm] Disabling audio 0 support
Feb 27 10:33:11 line-pc kernel: [   49.129730] thinkpad_acpi: EC reports that Thermal Table has changed
Feb 27 10:33:13 line-pc dbus[427]: [system] Activating service name='org.freedesktop.ConsoleKit' (using servicehelper)
Feb 27 10:33:13 line-pc dbus[427]: [system] Successfully activated service 'org.freedesktop.ConsoleKit'
Feb 27 10:33:17 line-pc dbus[427]: [system] Failed to activate service 'com.deepin.daemon.Accounts': timed out
Feb 27 10:33:17 line-pc dbus[427]: [system] Failed to activate service 'com.deepin.api.Device': timed out
Feb 27 10:33:17 line-pc com.deepin.daemon[1602]: utils.go:15: org.freedesktop.DBus.Error.TimedOut:Activation of com.deepin.api.Device timed out#012  ->  main.go:30#012  ->  proc.c:247#012  ->  proc.c:1445
Feb 27 10:33:17 line-pc com.deepin.daemon.Accounts[1602]: user.go:85: Open '/var/lib/AccountsService/icons/local' failed: open /var/lib/AccountsService/icons/local: no such file or directory
Feb 27 10:34:05 line-pc kernel: [  103.068109] usb 6-2: USB disconnect, device number 2
Feb 27 10:34:07 line-pc kernel: [  104.812128] usb 6-2: new low-speed USB device number 3 using uhci_hcd
Feb 27 10:34:07 line-pc kernel: [  104.987028] usb 6-2: New USB device found, idVendor=093a, idProduct=2510
Feb 27 10:34:07 line-pc kernel: [  104.987034] usb 6-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Feb 27 10:34:07 line-pc kernel: [  104.987038] usb 6-2: Product: USB Optical Mouse
Feb 27 10:34:07 line-pc kernel: [  104.987041] usb 6-2: Manufacturer: PixArt
Feb 27 10:34:07 line-pc mtp-probe: checking bus 6, device 3: "/sys/devices/pci0000:00/0000:00:1d.0/usb6/6-2"
Feb 27 10:34:07 line-pc kernel: [  105.004237] input: PixArt USB Optical Mouse as /devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0/input/input16
Feb 27 10:34:07 line-pc kernel: [  105.004426] hid-generic 0003:093A:2510.0002: input,hidraw0: USB HID v1.11 Mouse [PixArt USB Optical Mouse] on usb-0000:00:1d.0-2/input0
Feb 27 10:34:07 line-pc mtp-probe: bus: 6, device: 3 was not an MTP devic