我有双重启动win10/ubuntu-linux。我想升级我的Ubuntu 20.04到 20.10。但在过程中，我收到一条错误消息：
Efi 系统分区 (ESP) 不可用
我试过了：
sudo mount /boot/efi
之后我收到这个错误：
mount: /boot/efi: can't find UUID=0A0E-A110
但是我的 Linux 在 sda7 上具有不同的 UUID。因此我通过以下方式获取了 sda7 的 UUID：
sudo blkid /dev/sda7
输出：
/dev/sda7: UUID="fa092601-bef2-441e-92d4-2871f05e4a55" TYPE="ext4" PARTUUID="59087783-8cca-4a70-af2f-1472267b442c" fstab文件现在内容：
# /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>
# / was on /dev/sda9 during installation
UUID=fa092601-bef2-441e-92d4-2871f05e4a55 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda2 during installation
UUID=0A0E-A110 /boot/efi vfat umask=0077 0 1
/swapfile none swap sw 0 0
所以我把这行添加到我的/etc/fstab：
UUID=fa092601-bef2-441e-92d4-2871f05e4a55 /boot/efi ext4 umask=0077 0 1
之后 fstab 内容：
# /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>
# / was on /dev/sda9 during installation
UUID=fa092601-bef2-441e-92d4-2871f05e4a55 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda2 during installation
UUID=0A0E-A110 /boot/efi vfat umask=0077 0 1
UUID=fa092601-bef2-441e-92d4-2871f05e4a55 /boot/efi ext4 umask=0077 0 1
/swapfile none swap sw 0 0
我还评论了UUID=0A0E-A110。
但我总是收到同样的错误！
（注意：在使用 fstab 文件进行一些操作后，文件被损坏并且我的 Linux 启动失败！因此我使用实时 Linux 登录并恢复了 fstab！）
更新 该命令的输出：
sudo parted -l
是：
Model: ATA ST1000LM014-SSHD (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 106MB 105MB fat32 EFI system partition boot, esp
2 106MB 123MB 16.8MB Microsoft reserved partition msftres
3 123MB 157GB 157GB ntfs Basic data partition msftdata
4 157GB 157GB 522MB ntfs hidden, diag
5 157GB 438GB 281GB ntfs Basic data partition msftdata
6 438GB 732GB 294GB ntfs Basic data partition msftdata
7 732GB 1000GB 268GB ext4
答案1
谢谢@oldfred。
问题在于 fstab 文件中的 vfat（FAT32）的 UUID 与我系统的实际 FAT32 分区之间的差异。因此我通过以下方式获取了真实 vfat 分区的 UUID：
lsblk -f
输出中有以下一行：
├─sda1 vfat FAT32 2457-E435
因此将 fstab vfat 分区 UUID 更改为上面得到的 2457-E435（更改了最后一行之前的行。UUID 部分）：
# /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>
# / was on /dev/sda9 during installation
UUID=fa092601-bef2-441e-92d4-2871f05e4a55 / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda2 during installation 0A0E-A110
UUID=2457-E435 /boot/efi vfat umask=0077 0 1
/swapfile none swap sw 0 0
和问题解决了。