我在 Ubuntu 16.04.2 LTS 下扩展了一个 ext4 根分区，一切顺利。但是，即使重新启动后，新的大小也不可用。这不是重复的，因为类似的问题没有回答问题或没有解决问题。
df -h显示：
/dev/sda4 335G 319G 222M 100% /
resize2fs 已经完成，gparted但当再次运行它时，它会显示：
resize2fs 1.42.13 (17-May-2015)
Das Dateisystem ist bereits 89022208 (4k) Blöcke lang. Nichts zu tun!
（文件系统长度已达 89022208（4k）个块。无需执行！
blkid 说：（按要求）
/dev/sda1: LABEL="SYSTEM" UUID="B628-27FF" TYPE="vfat" PARTLABEL="EFI system partition" PARTUUID="d982ecb7-50a4-433f-bfc7-97ddd07a6d73"
/dev/sda3: LABEL="SpeedyGonzales" UUID="9C7CAE577CAE2BC8" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="b3859d9e-b355-4978-b6f2-67362892af75"
/dev/sda4: LABEL="Ubuntu" UUID="1729b519-f342-404b-aac7-418e3e6c2079" TYPE="ext4" PARTLABEL="Ubuntu" PARTUUID="0add1cbf-90d8-4724-b055-ccda7e6f7474"
/dev/sda5: LABEL="Arch" UUID="e67f147e-8416-4553-abc5-3b35c4fdbf37" TYPE="ext4" PARTLABEL="Arch" PARTUUID="ecf764ac-0a83-40e8-b2c6-56031d0f735d"
/dev/sdb1: LABEL="EFI" UUID="67E3-17ED" TYPE="vfat" PARTLABEL="EFI System Partition" PARTUUID="e9333c6d-68ab-4666-9a40-4c6e1591f104"
/dev/sdb2: UUID="fc0cc4bc-568e-3bbe-a3dc-46fcea0aa5d6" LABEL="HD" TYPE="hfsplus" PARTLABEL="HD" PARTUUID="f7bf60a4-b3a8-4662-813f-0aad68100a27"
/dev/sdb3: UUID="a7dafe95-71ba-37b2-ab04-1b9895052b0c" LABEL="Recovery HD" TYPE="hfsplus" PARTLABEL="Recovery HD" PARTUUID="a9a74bb3-2773-4d75-a702-cd5cbf99f925"
/dev/sr0: UUID="2016-06-03-08-15-54-00" LABEL="FRANKREICHST1DVD1" TYPE="udf"
/dev/sda2: PARTLABEL="Microsoft reserved partition" PARTUUID="0ee9290c-5f1a-4e4d-8879-034400cdec7b"
/etc/fstab 显示：（按要求）
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda7 during installation
UUID=1729b519-f342-404b-aac7-418e3e6c2079 / ext4 errors=remount-ro,noatime,lazytime 0 1
# swap was on /dev/sda6 during installation
#UUID=d24571b0-8d84-43e9-aadb-0e4c2ad6249b none swap sw 0 0
UUID=B628-27FF /boot/efi vfat defaults 0 1
这是 tunefs 输出：
tune2fs 1.42.13 (17-May-2015)
Filesystem volume name: Ubuntu
Last mounted on: /
Filesystem UUID: 1729b519-f342-404b-aac7-418e3e6c2079
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 22214192
Block count: 89022208
Reserved block count: 3944503
Free blocks: 5091295
Free inodes: 20326541
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1002
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8176
Inode blocks per group: 511
RAID stride: 32715
Flex block group size: 16
Filesystem created: Fri Feb 19 16:43:16 2016
Last mount time: Tue Jul 4 10:48:26 2017
Last write time: Tue Jul 4 10:48:26 2017
Mount count: 71
Maximum mount count: -1
Last checked: Tue Feb 14 21:59:02 2017
Check interval: 0 (<none>)
Lifetime writes: 2987 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 3292148
Default directory hash: half_md4
Directory Hash Seed: 45015b0b-d746-4270-8283-9c2401206980
Journal backup: inode blocks