tglase@tglase:~ $ schroot -prc vncsess dpkg -l mksh E: Only one action may be specified I: Run “schroot --help” to list usage example and all available options Apparently, there’s a workaround… tglase@tglase:~ $ schroot -prc vncsess -- dpkg -l mksh Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-======================-================-================-================================================= ii mksh 56c+wtf1 amd64 MirBSD Korn Shell … but POSIXly, and in related tools… tglase@tglase:~ $ sudo chroot --userspec=$(id -u):$(id -g) /home/AMD64 dpkg -l mksh Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-======================-================-================-================================================= ii mksh 56c+wtf1 amd64 MirBSD Korn Shell … a non-option argument terminates argument processing.