我有点困惑——我锁定了我的笔记本电脑，当打开（登录）时，我发现我的所有 VPN、终端和 chrome 标签都已关闭。
这是什么原因呢？
请告诉我我应该检查什么？日志？请指教。
steve@steve-ThinkPad-T480:~$ ls -al /var/crash
total 93436
drwxrwsrwt 2 root whoopsie 4096 Dec 12 16:48 .
drwxr-xr-x 14 root root 4096 Feb 10 2019 ..
-rw-r----- 1 steve whoopsie 41629796 Dec 12 12:53 _usr_bin_gnome-shell.1000.crash
-rw-r----- 1 steve whoopsie 8325264 Dec 12 12:53 _usr_bin_Xwayland.1000.crash
-rw-r----- 1 steve whoopsie 45704740 Dec 11 15:43 _usr_lib_rstudio_bin_rsession.1000.crash
steve@steve-ThinkPad-T480:~$ ls -al .local/share/gnome-shell/
total 16
drwx------ 2 steve steve 4096 Dec 17 16:55 .
drwx------ 28 steve steve 4096 Dec 17 16:42 ..
-rw-rw-r-- 1 steve steve 1422 Dec 17 16:55 application_state
-rw-rw-r-- 1 steve steve 880 Dec 11 15:47 notifications
free -h:
steve@steve-ThinkPad-T480:~$ free -h
total used free shared buff/cache available
Mem: 15G 7.0G 2.7G 1.9G 5.7G 6.1G
Swap: 2.0G 0B 2.0G
steve@steve-ThinkPad-T480:~$ sudo lshw -C memory
[sudo] password for steve:
*-memory
description: System Memory
physical id: 3
slot: System board or motherboard
size: 16GiB
*-bank:0
description: SODIMM DDR4 Synchronous Unbuffered (Unregistered) 2400 MHz (0.4 ns)
product: RMSA3300ME78HBF-2666
vendor: Fujitsu
physical id: 0
serial: 12B58072
slot: ChannelA-DIMM0
size: 16GiB
width: 64 bits
clock: 2400MHz (0.4ns)
*-bank:1
description: [empty]
physical id: 1
slot: ChannelB-DIMM0
*-cache:0
description: L1 cache
physical id: 7
slot: L1 Cache
size: 256KiB
capacity: 256KiB
capabilities: synchronous internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: 8
slot: L2 Cache
size: 1MiB
capacity: 1MiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: 9
slot: L3 Cache
size: 8MiB
capacity: 8MiB
capabilities: synchronous internal write-back unified
configuration: level=3
*-firmware
description: BIOS
vendor: LENOVO
physical id: b
version: N24ET53W (1.28 )
date: 10/17/2019
size: 128KiB
capacity: 15MiB
capabilities: pci pnp upgrade shadowing cdboot bootselect edd int13floppy720 int5printscreen int9keyboard int14serial int17printer int10video acpi usb biosbootspecification uefi
*-memory UNCLAIMED
description: Memory controller
product: Sunrise Point-LP PMC
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
version: 21
width: 32 bits
clock: 33MHz (30.3ns)
configuration: latency=0
resources: memory:e824c000-e824ffff