希望有人能帮助我恢复我的 ubuntu 服务器实例。虚拟机空间不足，我决定扩展虚拟磁盘。
lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from 37.00 GiB (9472 extents) to <74.00 GiB (18943 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
我注意到这个方法有效，但只到 75GB，所以我意识到我仍然需要增加分区大小，如下所示：
sudo growpart /dev/xvda 3
CHANGED: partition=3 start=2101248 old: size=155183104 end=157284352 new: size=417329119 end=419430367
然后我想我可以返回并再次运行原始命令，因为 lsblk 返回下面这个结果，这对我来说看起来很好：
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 55.5M 1 loop /snap/core18/2246
loop1 7:1 0 55.5M 1 loop /snap/core18/2253
loop2 7:2 0 61.9M 1 loop /snap/core20/1242
loop3 7:3 0 61.9M 1 loop /snap/core20/1270
loop4 7:4 0 67.2M 1 loop /snap/lxd/21803
loop5 7:5 0 67.2M 1 loop /snap/lxd/21835
loop6 7:6 0 42.2M 1 loop /snap/snapd/14066
loop7 7:7 0 43.3M 1 loop /snap/snapd/14295
sr0 11:0 1 1024M 0 rom
xvda 202:0 0 200G 0 disk
├─xvda1 202:1 0 1M 0 part
├─xvda2 202:2 0 1G 0 part /boot
└─xvda3 202:3 0 199G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 74G 0 lvm /
xvdb 202:16 0 5.4T 0 disk
└─xvdb1 202:17 0 5.4T 0 part /mnt/media
于是再次执行lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv但是遇到了这个错误：
user@server:~$ sudo lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
Volume group "ubuntu-vg" not found
Cannot process volume group ubuntu-vg
我最终放弃了，因为一切都正常，而且我增加了空间以满足一段时间的需要，但我认为我稍后会再回来...我在重新启动之前没有这样做，现在我被困在 initramfs 中，在启动时出现类似这样的错误，类似于我尝试扩展卷时遇到的错误：
Volume group "ubuntu-vg" not found
Cannot process volume group ubuntu-vg
...
ALERT! /dev/mapper/ubuntu--vg-ubuntu--lv does not exist. Dropping to a shell!
其他说明
回顾我所做的事情，我担心这可能是一个问题：
sudo fdisk -u /dev/mapper/ubuntu--vg-ubuntu--lv
Welcome to fdisk (util-linux 2.34).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
The old ext4 signature will be removed by a write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0xaae0d62a.
Command (m for help): p
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 73.102 GiB, 79452700672 bytes, 155181056 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xaae0d62a
Command (m for help): w
The partition table has been altered.
Syncing disks.
只是觉得上面的警告意味着某些东西需要更新，所以只是随意地对该磁盘和下面的磁盘进行了更新：
sudo fdisk /dev/xvda3
Welcome to fdisk (util-linux 2.34).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
The old LVM2_member signature will be removed by a write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0xfc8b2324.
Command (m for help): p
Disk /dev/xvda3: 73.102 GiB, 79453749248 bytes, 155183104 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xfc8b2324
Command (m for help): w
The partition table has been altered.
Syncing disks.
现在我被困在这个 initramfs shell 中，希望有人能帮助我修复这个问题而不用重建整个系统...我可能错过了一些问题和部分，但我尽可能地解释了可能出了什么问题，只是希望这可能是一件容易撤消的事情？