我只有超过 4GB 的可用空间（/dev/loop0）并且添加了第二个磁盘 /dev/sdb，我该如何使用其中任何一个来扩展 /boot 分区？
DF-H
Filesystem Size Used Avail Use% Mounted on
devtmpfs 24G 0 24G 0% /dev
tmpfs 24G 4.0K 24G 1% /dev/shm
tmpfs 24G 33M 24G 1% /run
tmpfs 24G 0 24G 0% /sys/fs/cgroup
/dev/sda2 414G 115G 278G 30% /
/dev/sda1 227M 179M 33M 85% /boot
/dev/loop0 3.9G 31M 3.6G 1% /tmp
tmpfs 4.8G 0 4.8G 0% /run/user/0
fdisk -l
Disk /dev/sda: 488.6 GB, 488552529920 bytes, 954204160 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
Disk label type: dos
Disk identifier: 0x0009d882
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 489471 243712 83 Linux
/dev/sda2 489472 881219583 440365056 83 Linux
/dev/sda3 881219584 943718399 31249408 82 Linux swap / Solaris
Disk /dev/loop0: 4294 MB, 4294967296 bytes, 8388608 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
Disk /dev/sdb: 5368 MB, 5368709120 bytes, 10485760 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
丢失 -a
/dev/loop0: [2050]:24122515 (/usr/tmpDSK)
/etc/fstab
UUID=b551a04e-f1e6-40f0-850e-470bcdf58a23 / ext4 usrjquota=quota.user,jqfmt=vfsv1 1 1
UUID=2a14690d-e9d7-4d67-9e97-e7aab5d36a8f /boot ext4 defaults 1 2
UUID=5ca0c34b-1ca2-4e38-9720-61995cc88c42 swap swap defaults 0 0
/usr/tmpDSK /tmp ext3 defaults,noauto 0 0