Usb storage can't be mount as overlay

Installing and Using OpenWrt
1

Hi,
since several weeks my openwrt router was working very well with an overlay usr storage of 8Gb...
but i don't know why today i can mount my usb dongle but not as overlay...
which command permit to change /dev/ubi0_1 to /dev/sdb1 ?
regards (excuse my bad english)

/dev/sdb1: UUID="d792e497-ff71-4885-a891-3c80872ed503" LABEL="extroot" VERSION="1.0" TYPE="ext4"

Filesystem Size Used Available Use% Mounted on
/dev/root 4.3M 4.3M 0 100% /rom
tmpfs 122.2M 228.0K 122.0M 0% /tmp
/dev/ubi0_1 33.0M 28.7M 2.6M 92% /overlay
overlayfs:/overlay 33.0M 28.7M 2.6M 92% /
tmpfs 512.0K 0 512.0K 0% /dev

2

ok, i've follow the post "extroot usb" and now overlay is my usb storage...
but i can't use sudo, i've an error :
sudo: error in /etc/sudo.conf, line 0 while loading plugin "sudoers_policy"
sudo: unable to load /usr/lib/sudo/�: Error loading shared library /usr/lib/sudo/�: No such file or directory
sudo: fatal error, unable to load plugins

3

Why would you sudo, when the only user in Openwrt is root ?

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