我正在嘗試安裝新軟體包並收到以下錯誤，我該如何解決該問題？
# sudo apt-get install openssl
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.
這是df --si輸出：
Filesystem Size Used Avail Use% Mounted on
udev 238M 0 238M 0% /dev
tmpfs 52M 4.0M 48M 8% /run
/dev/vda1 5.2G 5.2G 0 100% /
tmpfs 256M 0 256M 0% /dev/shm
tmpfs 5.3M 0 5.3M 0% /run/lock
tmpfs 256M 0 256M 0% /sys/fs/cgroup
tmpfs 52M 0 52M 0% /run/user/0