diff --git a/ipfs-install.sh b/ipfs-install.sh
index a5f5aae..e6c3605 100755
--- a/ipfs-install.sh
+++ b/ipfs-install.sh
@@ -13,8 +13,8 @@ else
   fi
 fi
 
-curl https://dist.ipfs.tech/kubo/v$VERSION/kubo_$VERSION_linux-amd64.tar.gz -o kubo.tgz
-tar xzf kubo.tgz
+curl https://dist.ipfs.tech/kubo/v$VERSION/kubo_v$VERSION_linux-amd64.tar.gz -o kubo_v$VERSION.tgz
+tar xzf kubo_v$VERSION.tgz
 ## install ./kubo/ipfs to /usr/local/bin/ipfs
 cd kubo && sudo bash install.sh
 
diff --git a/nixhome/.bashrc b/nixhome/.bashrc
index 08c9694..12c0713 100644
--- a/nixhome/.bashrc
+++ b/nixhome/.bashrc
@@ -90,6 +90,7 @@ esac
 # nvm settings
 if [ -d $HOME/.nvm ]
 then
+  # 注意，这句 export 导致 `su` 会继承原用户的环境变量 NVM_DIR=/home/原用户/.nvm，可能导致不符合预期的行为。因此要 `su -` 更安全。
   export NVM_DIR="$HOME/.nvm"
   [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
   [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
diff --git a/nvm-install.sh b/nvm-install.sh
index 3ee90e6..673e49a 100755
--- a/nvm-install.sh
+++ b/nvm-install.sh
@@ -1,6 +1,17 @@
-curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.2/install.sh | bash
+# curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.2/install.sh | bash
+# pushd /faronear/fon/sysconfig
+# # 取消被默认添加到 .bashrc 的设置，already integrated in .bashrc
+# git reset . && git checkout .
+# popd
 
-pushd /faronear/fon/sysconfig
-# 取消被默认添加到 .bashrc 的设置，already integrated in .bashrc
-git reset . && git checkout .
-popd
+# 注意，这个安装脚本先会查看 NVM_DIR。如果是从其他用户 `su` 过来的，继承了这个变量 NVM_DIR=/home/原用户/.nvm，导致无法安装在当前 root 用户下。
+# 因此要么 `su -` 要么不使用安装脚本，而是直接执行脚本里的真正安装动作，即 git clone
+
+git clone https://github.com/nvm-sh/nvm.git ~/.nvm
+
+echo Add these lines to your launch script such as .bashrc :
+echo '########################################################################'
+echo 'export NVM_DIR="$HOME/.nvm"'
+echo '[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"'
+echo '[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"'
+echo '########################################################################'