我Ubuntu 18.04.2 LTS在 Windows 10 双启动上安装了操作系统，一个月内运行良好，没有任何问题。我是 UBuntu 操作系统的初学者，我按照在线教程自行设置操作系统。
最近，我多次遇到屏幕冻结的情况，每次我都需要强制停止并等待一段时间然后重新启动。我尝试了几个在线教程来解决我的问题。我的硬件配置是 nvidia Graphics 和 i7-8th gen 以及 16GB RAM。
我尝试了以下命令，VGA 兼容性显示 Intel，而不是 nvidia。不确定哪一个是正确的。
输出如下：
lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Device 3e9b
lspci -v
00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers (rev 07)
Subsystem: Dell Device 086f
Flags: bus master, fast devsel, latency 0
Capabilities: <access denied>
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 07) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 122
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 00004000-00004fff
Memory behind bridge: a3000000-a40fffff
Prefetchable memory behind bridge: 0000000090000000-00000000a1ffffff
Capabilities: <access denied>
Kernel driver in use: pcieport
00:02.0 VGA compatible controller: Intel Corporation Device 3e9b (prog-if 00 [VGA controller])
Subsystem: Dell Device 086f
Flags: bus master, fast devsel, latency 0, IRQ 142
Memory at a2000000 (64-bit, non-prefetchable) [size=16M]
Memory at 80000000 (64-bit, prefetchable) [size=256M]
I/O ports at 5000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
01:00.0 3D controller: NVIDIA Corporation GP107M [GeForce GTX 1050 Ti Mobile] (rev a1)
Subsystem: Dell GP107M [GeForce GTX 1050 Ti Mobile]
Flags: bus master, fast devsel, latency 0, IRQ 144
Memory at a3000000 (32-bit, non-prefetchable) [size=16M]
Memory at 90000000 (64-bit, prefetchable) [size=256M]
Memory at a0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 4000 [size=128]
[virtual] Expansion ROM at a4000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nvidia
Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia
我目前正在使用 nvidia-390 驱动程序和 lightDM 包。请建议这是否是图形问题，或者我是否应该安装任何软件/驱动程序来解决这些问题？