The development branch of OpenWrt has switched to the musl c library on June 16. All packages downloaded from the development (trunk) repository since then may need the musl c library instead of the uClibc library which was used before that.
Many if not most packages rely on a c library, if you install a critical package that can't find the c library it needs you will be in a very bad place. Busybox is an excellent example if it doesn't work almost anything on your vocore won't work. A typical failure looks like:
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ls /root
-ash: ls: not found
To see which library your vocore has on it do
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ls -l /lib | grep libc
If you see
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root@VoCore:/# ls -l /lib | grep libc
-rwxr-xr-x 1 root root 28970 Sep 24 11:37 ld-uClibc-0.9.33.2.so
lrwxrwxrwx 1 root root 21 Sep 24 20:24 ld-uClibc.so.0 -> ld-uClibc-0.9.33.2.so
lrwxrwxrwx 1 root root 21 Sep 24 20:24 libc.so.0 -> libuClibc-0.9.33.2.so
-rwxr-xr-x 1 root root 9310 Sep 24 11:37 libcrypt-0.9.33.2.so
lrwxrwxrwx 1 root root 20 Sep 24 20:24 libcrypt.so.0 -> libcrypt-0.9.33.2.so
-rwxr-xr-x 1 root root 355497 Sep 24 11:37 libuClibc-0.9.33.2.so
root@VoCore:/#
You have a uClibc based system and you should NOT use the trunk packages at https://downloads.openwrt.org/snapshots/trunk/ or packages or programs compiled on a buildroot downloaded after June 16.
If you want to use the trunk repository download the full image from it and flash it to your VoCore first.
If you see
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root@VoCore:/# ls -l /lib |grep libc
lrwxrwxrwx 1 root root 7 Sep 25 14:26 ld-musl-mipsel-sf.so.1 -> libc.so
-rwxr-xr-x 1 root root 647792 Sep 25 08:41 libc.so
root@VoCore:/#
You have a musl based system and you should not use chaos calmer packages at https://downloads.openwrt.org/chaos_calmer/15.05/ or packages or programs compiled on a buildroot downloaded before June 16.
If you want to use the chaos calmer repository download the full image from it and flash your VoCore first.