command not found: sudo

After reading about the lately discovered vulnerability with sudo, I decided to update to 1.8.28 manually. I downloaded deb file from sudo.ws and used dpkg to install it, and it failed due to lack of dependencies.

sudo dpkg -i debs/sudo_1.8.28-1_ubu1804_i386.deb  (Reading database ... 232031 files and directories currently installed.) Preparing to unpack .../sudo_1.8.28-1_ubu1804_i386.deb ... Unpacking sudo:i386 (1.8.28-1) over (1.8.27-1ubuntu1.1) ... dpkg: dependency problems prevent configuration of sudo:i386: sudo:i386 depends on libc6. sudo:i386 depends on libpam0g. sudo:i386 depends on libpam-modules. sudo:i386 depends on zlib1g. sudo:i386 depends on libselinux1. sudo:i386 depends on libaudit1.  dpkg: error processing package sudo:i386 (--install): dependency problems - leaving unconfigured Processing triggers for man-db (2.8.5-2) ... Errors were encountered while processing: sudo:i386 

After that I can’t call sudo any more and it seems to be damaged cause I can locate it in /usr/bin/sudo:

l /usr/bin/sudo -rwsr-xr-x 1 root root 479K Oct 10 20:15 /usr/bin/sudo 

Since there is no Root user available on Ubuntu I was wondering if there is any solution other than rebooting as root in recovery mode?