Linux系统提示空间不足但大容量分区未利用的问题求助

AI 小北

2026-4-17

当我尝试更新机器或安装任何软件时，都会收到空间不足的错误：

alex@servercomputer:~$ sudo apt install lvm2
Reading package lists... Error!
E: Write error - write (28: No space left on device)
E: IO Error saving source cache
E: The package lists or status file could not be parsed or opened.

我检查了存储情况，发现原本5GB的分区几乎全被/var/lib/snapd/snaps下的一堆旧snap包占满了，导致机器无法正常运行，甚至删除旧snap时还会出现超时错误。但明明我有一块1TB的硬盘啊...

运行df -h后我发现了奇怪的情况：

alex@servercomputer:~$ df -h

Filesystem      Size  Used Avail Use% Mounted on
udev            3.8G     0  3.8G   0% /dev
tmpfs           784M   79M  706M  10% /run
/dev/sda2       825G  7.8G  775G   1% /
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda3        21G  6.6G   13G  34% /home
/dev/sda4       5.6G  5.6G     0 100% /var
/dev/loop0      128K  128K     0 100% /snap/bare/5
/dev/loop2       64M   64M     0 100% /snap/core20/1891
/dev/loop4       56M   56M     0 100% /snap/core18/2751
/dev/loop7      461M  461M     0 100% /snap/gnome-42-2204/102
/dev/loop1       56M   56M     0 100% /snap/core18/2409
/dev/loop6      350M  350M     0 100% /snap/gnome-3-38-2004/140
/dev/loop8       92M   92M     0 100% /snap/gtk-common-themes/1535
/dev/loop9       62M   62M     0 100% /snap/core20/1434
/dev/loop3      165M  165M     0 100% /snap/gnome-3-28-1804/198
/dev/loop5      219M  219M     0 100% /snap/gnome-3-34-1804/77
/dev/loop10      82M   82M     0 100% /snap/gtk-common-themes/1534
/dev/loop14      74M   74M     0 100% /snap/core22/634
/dev/loop13      74M   74M     0 100% /snap/core22/750
/dev/loop18     165M  165M     0 100% /snap/gnome-3-28-1804/161
/dev/loop17      55M   55M     0 100% /snap/snap-store/558
/dev/loop11     249M  249M     0 100% /snap/gnome-3-38-2004/99
/dev/loop20      13M   13M     0 100% /snap/snap-store/959
/dev/loop12     219M  219M     0 100% /snap/gnome-3-34-1804/93
/dev/loop16     120M  120M     0 100% /snap/mc-installer/588
/dev/loop19      54M   54M     0 100% /snap/snapd/19361
/dev/loop15     106M  106M     0 100% /snap/mc-installer/613
/dev/sda1       945M  294M  587M  34% /boot
/dev/sda7       976M  5.3M  970M   1% /boot/efi
tmpfs           784M   68K  784M   1% /run/user/1000

（附df -h命令输出的截图）

我刚接触Linux，这情况实在太让人困惑了。/目录所在的/dev/sda2分区还有超大的可用空间，但我好像没法用到它，现在整个系统似乎都在已经被完全占满的/dev/sda4（挂载到/var）上运行，导致我连安装软件来解决这个问题都做不到。

抱歉格式有点乱，这是我第一次发帖，任何帮助都非常感谢！

备注：内容来源于stack exchange，提问作者Alex Theophanis