pg_resetxlog command not found
That's because from version 10 it has been renamed to pg_resetwal. And the binary is located in /usr/lib/postgresql/&lt;version&gt;/bin.
The pg_xlog directory was renamed to pg_wal in version 10 and several functions, tools and options as well, to reflect that change. See Postgres 10 release notes:


Rename write-ahead log directory pg_xlog to pg_wal, and rename transaction status directory pg_clog to pg_xact (Michael Paquier)
Users have occasionally thought that these directories contained only inessential log files, and proceeded to remove write-ahead log files or transaction status files manually, causing irrecoverable data loss. These name changes are intended to discourage such errors in future.

Rename SQL functions, tools, and options that reference xlog to wal (Robert Haas)
For example, pg_switch_xlog() becomes pg_switch_wal(), pg_receivexlog becomes pg_receivewal, and --xlogdir becomes --waldir. This is for consistency with the change of the pg_xlog directory name; in general, the xlog terminology is no longer used in any user-facing places.