Opkg fails to install any software

after a system reboot the system is unable to install any software. Internet in the LAN works fine, but i cannot install packages in router through opkg.
Here is the error:

root@OpenWrt_alix: ~ $ opkg update
Downloading http://downloads.openwrt.org/releases/19.07.6/targets/x86/geode/packages/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_core
Downloading http://downloads.openwrt.org/releases/19.07.6/targets/x86/geode/packages/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/base/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_base
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/base/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/freifunk/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_freifunk
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/freifunk/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/luci/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_luci
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/luci/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/packages/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_packages
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/packages/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/routing/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_routing
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/routing/Packages.sig
Signature check passed.
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/telephony/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_telephony
Downloading http://downloads.openwrt.org/releases/19.07.6/packages/i386_pentium/telephony/Packages.sig
Signature check passed.
root@OpenWrt_alix: ~ $ ping www.google.com
PING www.google.com (142.250.185.164): 56 data bytes
64 bytes from 142.250.185.164: seq=0 ttl=119 time=60.390 ms
64 bytes from 142.250.185.164: seq=1 ttl=119 time=60.837 ms
64 bytes from 142.250.185.164: seq=2 ttl=119 time=60.213 ms
^C
--- www.google.com ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 60.213/60.480/60.837 ms
root@OpenWrt_alix: ~ $ opkg install htop
Unknown package 'htop'.
Collected errors:
 * opkg_install_cmd: Cannot install package htop.
root@OpenWrt_alix: ~ $

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