当我尝试安装特定的ruby版本（1.9.1）时，我按照those步骤在ubuntu 16.04上安装rvm我有这个错误
Error running '__rvm_make -j4',
please read /home/igor/.rvm/log/1513069679_ruby-1.9.1-p431/make.log
There has been an error while running make. Halting the installation.
错误日志说
gcc -shared -o ../../.ext/x86_64-linux/curses.so curses.o -L. -L../.. -L.
-rdynamic -Wl,-export-dynamic -Wl,-R -Wl,/home/igor/.rvm/rubies/ruby-
1.9.1-p431/lib -L/home/igor/.rvm/rubies/ruby-1.9.1-p431/lib -lruby -
lncurses -ltinfo -lpthread -lrt -ldl -lcrypt -lm -lc
make[1]: Leaving directory '/home/igor/.rvm/src/ruby-1.9.1-p431/ext/curses'
compiling dbm
make[1]: Entering directory '/home/igor/.rvm/src/ruby-1.9.1-p431/ext/dbm'
gcc -I. -I../../.ext/include/x86_64-linux -I../.././include -
I../.././ext/dbm -DRUBY_EXTCONF_H=\"extconf.h\" -fPIC -O2 -g -Wall -
Wno-parentheses -fPIC -o dbm.o -c dbm.c
gcc -shared -o ../../.ext/x86_64-linux/dbm.so dbm.o -L. -L../.. -L. -
rdynamic -Wl,-export-dynamic -Wl,-R -Wl,/home/igor/.rvm/rubies/ruby-
1.9.1-p431/lib -L/home/igor/.rvm/rubies/ruby-1.9.1-p431/lib -lruby -
lgdbm_compat -lgdbm -lpthread -lrt -ldl -lcrypt -lm -lc
make[1]: Leaving directory '/home/igor/.rvm/src/ruby-1.9.1-p431/ext/dbm'
compiling digest
make[1]: Entering directory '/home/igor/.rvm/src/ruby-1.9.1-
p431/ext/digest'
gcc -I. -I../../.ext/include/x86_64-linux -I../.././include -
I../.././ext/digest -DRUBY_EXTCONF_H=\"extconf.h\" -fPIC -O2 -g -Wall -
Wno-parentheses -fPIC -o digest.o -c digest.c
mkdir -p ../../.ext/include/ruby
mkdir -p ../../.ext/common/digest
cp ../.././ext/digest/lib/digest.rb ../../.ext/common
cp ../.././ext/digest/lib/digest/hmac.rb ../../.ext/common/digest
cp ../.././ext/digest/digest.h ../../.ext/include/ruby
cp: cannot create regular file '../../.ext/common/digest': File exists
Makefile:163: recipe for target '../../.ext/common/digest/hmac.rb' failed
make[1]: *** [../../.ext/common/digest/hmac.rb] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/home/igor/.rvm/src/ruby-1.9.1-
p431/ext/digest'
uncommon.mk:134: recipe for target 'mkmain.sh' failed
make: *** [mkmain.sh] Error 1
++ return 2
你能帮我解决一下吗？