OpenWRT：无法在USB记忆棒上安装软件包

Question

我无法在安装在USB上的文件系统上安装python包。它试图覆盖但不是在USB上。有人可以帮我吗？

请在下面找到详细信息。

版本：

root@LEDE:~# cat /etc/openwrt_release
DISTRIB_ID='LEDE'
DISTRIB_RELEASE='17.01.4'
DISTRIB_REVISION='r3560-79f57e422d'
DISTRIB_CODENAME='reboot'
DISTRIB_TARGET='ar71xx/generic'
DISTRIB_ARCH='mips_24kc'
DISTRIB_DESCRIPTION='LEDE Reboot 17.01.4 r3560-79f57e422d'
DISTRIB_TAINTS='no-all'

Filesytem

root@LEDE:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root                 2.3M      2.3M         0 100% /rom
tmpfs                    61.3M    560.0K     60.8M   1% /tmp
/dev/mtdblock3            4.4M      3.8M    632.0K  86% /overlay
overlayfs:/overlay        4.4M      3.8M    632.0K  86% /
tmpfs                   512.0K         0    512.0K   0% /dev
/dev/sda1                29.2G     44.0M     27.7G   0% /mnt/usb

OPKG配置

root@LEDE:~# cat /etc/opkg.conf
dest root /
dest ram /tmp
dest usb /mnt/usb
lists_dir ext /var/opkg-lists
option overlay_root /overlay
option check_signature 1

**安装Python **

root@LEDE:~# opkg install -d usb python
Installing python (2.7.14-5) to root...
Downloading http://downloads.lede-project.org/releases/17.01.4/packages/mips_24kc/packages/python_2.7.14-5_mips_24kc.ipk
Installing python-codecs (2.7.14-5) to root...
Collected errors:
 * verify_pkg_installable: Only have 632kb available on filesystem /overlay, pkg python-codecs needs 837
 * opkg_install_cmd: Cannot install package python.