电脑规格：
型号：Dell XPS15 9550
处理器：Intel i7-6700HQ
GPU：NVIDIA GeForce GTX 960M
RAM：16GB
存储：1TB SSD
双启动 Ubuntu 18.04/Windows 10
更换电脑主板后，BIOS 配置被设置为默认，Ubuntu 分区未被检测到。Windows 分区保持完好无损。接下来，我对 BIOS 进行了以下更改以重新建立分区：
-禁用安全启动。-
在启动列表选项（设置为 UEFI）中，添加了启动选项Ubuntu文件名为：/EFI/ubunt/shimx64.efi
使用这些配置我在启动时收到以下错误：
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_F
acpi PHPOCOB:04: Failed to set initial power state
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_
ACPI Error: [\_SB_.PCIO.LPCB.H_EC.EC.ECAV] Namespace lookup failure,
ACPI Error: Method parse/execution failed \_T2.FN04._ON, AE_NOT_
Couldn't get size: 0x800000000000000e
PKCS#7 signature not signed with a trusted key
PKCS#7 signature not signed with a trusted key
PKCS#7 signature not signed with a trusted key
之后，系统提示我使用 Busy Box v1.27.2 (ubuntu) 内置 shell (ash)
(initramfs)
请指教如何恢复我的分区。从 Windows 分区中我可以看到该分区是“健康的”，我还尝试将 BIOS SATA 操作从“RAID On”配置为“AHCI”，但我得到的却是蓝色错误屏幕。