我将 ubuntu 服务器从 18.04 升级到 20.04，现在启动时出现以下错误：
[ TIME ] Timed out waiting for device /dev/md1
[DEPEND] Dependency failed for mnt/md1
我在 ubuntu 18 上设置了 raid1，运行正常。我仍然可以通过 SSH 进入服务器并运行命令，但服务器上的监视器卡在上面的错误上。
我读了很多帖子，但不知道该怎么办。我注意到两个驱动器的 UUID 相同，这可能是个问题吗？以下是一些信息：
~$ lsblk -f
NAME FSTYPE LABEL UUID FSAVAIL FSUSE% MOUNTPOINT
loop0 squashfs 0 100% /snap/snapd/20290
loop1 squashfs 0 100% /snap/lxd/24061
loop2 squashfs 0 100% /snap/core20/2015
sda
├─sda1 vfat E23E-01B3
└─sda2 linux_raid_member mypc:0 febc2d66-d036-8732-0647-9ef774a9c450
└─md0 LVM2_member 4AgQTj-zcr5-DJdl-R2h7-R32O-rfVY-0pphnU
├─vg-swap swap 2432e24c-7852-499c-aa1f-8483120393f5 [SWAP]
├─vg-root ext4 b923aec1-8737-4d7b-b2ad-aed2ef8dff9b 77.2G 10% /
├─vg-tmp ext4 da098742-230b-4d98-b532-afcee84ab0b1 43.2G 0% /tmp
├─vg-var ext4 8b605aca-3f9d-4f2f-b734-e61a6fd1b843 14.1G 33% /var
└─vg-home ext4 ee4d57a5-481c-48a1-afcb-5ecc9f89cf94 2.2T 52% /home
sdb
├─sdb1 vfat E23E-01B3 945.1M 1% /boot/efi
└─sdb2 linux_raid_member mypc:0 febc2d66-d036-8732-0647-9ef774a9c450
└─md0 LVM2_member 4AgQTj-zcr5-DJdl-R2h7-R32O-rfVY-0pphnU
├─vg-swap swap 2432e24c-7852-499c-aa1f-8483120393f5 [SWAP]
├─vg-root ext4 b923aec1-8737-4d7b-b2ad-aed2ef8dff9b 77.2G 10% /
├─vg-tmp ext4 da098742-230b-4d98-b532-afcee84ab0b1 43.2G 0% /tmp
├─vg-var ext4 8b605aca-3f9d-4f2f-b734-e61a6fd1b843 14.1G 33% /var
└─vg-home ext4 ee4d57a5-481c-48a1-afcb-5ecc9f89cf94 2.2T 52% /home
~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
/dev/mapper/vg-root / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
UUID=E23E-01B3 /boot/efi vfat umask=0077 0 1
/dev/mapper/vg-home /home ext4 defaults 0 2
/dev/mapper/vg-tmp /tmp ext4 defaults 0 2
/dev/mapper/vg-var /var ext4 defaults 0 2
/dev/mapper/vg-swap none swap sw 0 0
/dev/md1 /mnt/md1 ext4 defaults,nofail,discard 0 0
~$ cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb2[1] sda2[0]
5859412992 blocks super 1.2 [2/2] [UU]
bitmap: 1/44 pages [4KB], 65536KB chunk
unused devices: <none>
~$ cat /etc/mdadm/mdadm.conf
# mdadm.conf
#
# !NB! Run update-initramfs -u after updating this file.
# !NB! This will ensure that initramfs has an uptodate copy.
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default (built-in), scan all partitions (/proc/partitions) and all
# containers for MD superblocks. alternatively, specify devices to scan, using
# wildcards if desired.
#DEVICE partitions containers
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# instruct the monitoring daemon where to send mail alerts
MAILADDR root
# definitions of existing MD arrays
ARRAY /dev/md/0 metadata=1.2 UUID=febc2d66:d0368732:06479ef7:74a9c450 name=mypc:0
ARRAY /dev/md1 metadata=1.2 name=mypc:1 UUID=472411d9:f517c8d8:0d6c26da:15a53b24