pkg update
No mirror or mirror group selected. You might want to select one by running 'termux-change-repo'
Checking availability of current mirror:
[*] https://mirror.vern.cc/termux/termux-main: ok
Reading package lists... Done
E: Could not get lock /data/data/com.termux/files/usr/var/lib/apt/lists/lock. It is held by process 1792 (apt)
N: Be aware that removing the lock file is not a solution and may break your system.
E: Unable to lock directory /data/data/com.termux/files/usr/var/lib/apt/lists/

出现此问题的原因是因为可能是有另外一个程序正在运行，导致资源被锁不可用。而导致资源被锁的原因，可能是上次安装时没正常完成，而导致出现此状况。
只需要根据文件路径将资源删除即可

rm /data/data/com.termux/files/usr/var/lib/apt/lists/lock