couchdb-installer-ubuntu.sh

#!/usr/bin/env bash

# where do you want couchdb and its deps to be installed
COUCHDB_PREFIX="/opt/couchdb-1.0.1"

# Let's determine the correct arcitecture and choose the installer
if [ "`uname -m`" = "x86_64" ]; then
  echo "Using 64-bit installer"
  COUCHDB_INSTALLER_DOC_ID="26f246a0fe23d6a53d5326713308f43c"
  COUCHDB_INSTALLER_BIN="install-couchdb-1.0.1_rel1-linux-x64.bin"
else
  echo "Using 32-bit installer"
  COUCHDB_INSTALLER_DOC_ID="26f246a0fe23d6a53d53267133090142"
  COUCHDB_INSTALLER_BIN="install-couchdb-1.0.1_rel1-linux.bin"
fi
COUCHDB_INSTALLER_URL="http://dl.couchone.com/dl/$COUCHDB_INSTALLER_DOC_ID/$COUCHDB_INSTALLER_BIN"

echo "Downloading and verifying installer"
curl $COUCHDB_INSTALLER_URL -O --silent
curl "http://dl.couchone.com/dl/_design/dl/_show/sha1/$COUCHDB_INSTALLER_DOC_ID" --silent | sha1sum --status --check -
if [ "$?" -ne "0" ]; then
  echo "Download verification failed"
  exit 1
fi

echo "Running the installer"
chmod u+x $COUCHDB_INSTALLER_BIN && sudo ./$COUCHDB_INSTALLER_BIN  --prefix $COUCHDB_PREFIX --mode unattended
if [ "$?" -ne "0" ]; then
  echo "Installer problem"
  echo "Downloaded the installer from: $COUCHDB_INSTALLER_URL"
  exit 1
fi

# link into /etc/init.d/couchdb and setup couchdb for auto-startup
sudo ln -s $COUCHDB_PREFIX/etc/init.d/couchdb /etc/init.d/couchdb
sudo ln -s $COUCHDB_PREFIX/etc/default/couchdb /etc/default/couchdb
sudo update-rc.d couchdb defaults

# prepare system
sudo adduser --system \
             --home $COUCHDB_PREFIX/var/lib/couchdb \
             --no-create-home \
             --shell /bin/bash \
             --group --gecos \
             "CouchDB Administrator" couchdb

# ensure that our new user owns it's stuff
sudo chown -R couchdb:couchdb $COUCHDB_PREFIX/{etc,var/lib,var/run,var/log}/couchdb

sudo /etc/init.d/couchdb restart

echo "Done!"

In line 27, I think you need && sudo instead of just &&

you are right, fixed and thanks!